SDLRC - Diamond - Color

The Sheahan Diamond Literature Reference Compilation - Scientific and Media Articles based on Major Keyword - Diamond - Color

The Sheahan Diamond Literature Reference Compilation is compiled by Patricia Sheahan who publishes on a monthly basis a list of new scientific articles related to diamonds as well as media coverage and corporate announcements called the Sheahan Diamond Literature Service that is distributed as a free pdf to a list of followers. Pat has kindly agreed to allow her work to be made available as an online digital resource at Kaiser Research Online so that a broader community interested in diamonds and related geology can benefit. The references are for personal use information purposes only; when available a link is provided to an online location where the full article can be accessed or purchased directly. Reproduction of this compilation in part or in whole without permission from the Sheahan Diamond Literature Service is strictly prohibited. Return to Diamond Keyword Index

Sheahan Diamond Literature Reference Compilation - Scientific Articles by Author for all years
A-An	Ao+	B-Bd	Be-Bk	Bl-Bq	Br+	C-Cg	Ch-Ck	Cl+	D-Dd	De-Dn	Do+	E	F-Fn	Fo+	G-Gh	Gi-Gq	Gr+	H-Hd	He-Hn	Ho+	I	J	K-Kg	Kh-Kn	Ko-Kq	Kr+	L-Lh
Li+	M-Maq	Mar-Mc	Md-Mn	Mo+	N	O	P-Pd	Pe-Pn	Po+	Q	R-Rh	Ri-Rn	Ro+	S-Sd	Se-Sh	Si-Sm	Sn-Ss	St+	T-Th	Ti+	U	V	W-Wg	Wh+	X	Y	Z

Sheahan Diamond Literature Reference Compilation - Media/Corporate References by Name for all years
A	B	C	D-Diam	Diamonds	Diamr+	E	F	G	H	I	J	K	L	M	N	O	P	Q	R	S	T	U	V	W	X	Y	Z

Each article reference in the SDLRC is tagged with one or more key words assigned by Pat Sheahan to highlight the main topics of the article. In an effort to make it easier for users to track down articles related to a specific topic, KRO has extracted these key words and developed a list of major key words presented in this Key Word Index to which individual key words used in the article reference have been assigned. In most of the individual Key Word Reports the references are in crhonological order, though in some such as Deposits the order is first by key word and then chronological. Only articles classified as "technical" (mainly scientific journal articles) and "media" (independent media articles) are included in the Key Word Index. References that were added in the most recent monthly update are highlighted in yellow.

The keyword Diamond - Color indicates that the article discusses the color of a diamond which can range from colorless to almost every color such as pink, blue, green, and yellow as well as less desirable colors such as brown. These articles tend to deal with what causes a certain color to occur, and what the conditions might be for the formation of the color in a diamond.

Diamond - Color
Posted/ Published	Author	Title	Source	Region	Keywords
DS1910-0470 1915	Mennell, F.P.	Note on the Colours of Some Alluvial Diamonds	Mineralogical Magazine., Vol. 17, No. 81, PP. 202-204.	Zimbabwe	Coloured Diamonds, Crystallography
DS1950-0260 1956	Brendler, W.	Gruene Diamanten aus Suedafrika	Aufschluss, Vol. 7, PP. 2-4.	Southwest Africa, Namibia, South Africa	Diamond, Morphology, Colour
DS1960-0696 1966	Lenzen, G.	Die Qualitatsmerkmale des Diamanten Geschichtliches Unsd Gegenwartiges.	Hamburg: Lenzen And Stormer., 39P.	India	Diamond Colour
DS1960-1232 1969	Yeremenko, G.K., Polkanov, YU.A.	Luminescence of Small Diamonds from Sandy Sediments of the Ukraine.	Doklady Academy of Science USSR, Earth Science Section., Vol. 188, No. 4, PP. 149-151.	Russia	Kimberlite, Photoluminescence, Colour
DS1970-0707 1973	Harris, J.W.	Observations on Letseng la Terae Diamonds	Maseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 37-38.	Lesotho	Mineralogy, Morphology, Colour
DS1981-0124 1981	Cottrant, J.F., Calas, G.	Etude de la Coloration de Quelques Diamants du Museum National D'histoire Naturelle.	Rev. Gemmol. A.f.g., No. 67, PP. 2-5.	Global	Diamonds, Colour
DS1982-0386 1982	Malinko, S.V., Ilupin, I.P., Berman, I.B., Stoliarova, A.N.	Boron in Kimberlites of the Kuoika Field According to the Dat a of Local Radioagraphic Analysis.	Doklady Academy of Sciences AKAD. NAUK SSSR., Vol. 265, No. 1, PP. 170-172.	Russia	Spectrometry, Boron
DS1983-0317 1983	Huffer, H.	Fancy Diamonds Meld Colour and Brilliance	Jewellers Circular Keystone, Vol. 149, No. 12, PP. 33-40.	Global	Colour, Investment
DS1984-0800 1984	Zinchuk, N.N., Melnik, YU.M., Kharkiv, A.D.	First Ferroszaibelyite Finds in Kimberlitic Rocks #2	Doklady Academy of Science USSR, Earth Science Section, Vol. 275, No. 1-6, pp. 103-107	Russia	Mir Pipe, Boron, Mineral Chemistry
DS1985-0291 1985	Hofer, S.C.	Pink Diamonds from Australia	Gems And Gemology, Vol. 21, FALL PP. 147-155.	Global	Diamond Morphology, Colour, History, Spectral Analysis, Inclusions
DS1985-0640 1985	Springfield, J.T., Mansker, W.L.	Factors Affecting Garnet Metamerism and Applications in Kimberlite Evaluation/exploration.	Geological Society of America (GSA), Vol. 17, No. 3, P. 193. (abstract.).	Global	Garnet, Population, Mineral Chemistry, Colour
DS1986-0276 1986	Gems & Gemology	Natural color light green diamonds	Gems and Gemology, Vol. XXII Fall, p. 171	Global	Diamond, Colour
DS1986-0427 1986	Kaye, D.	The rarest geM	Town and Country, Vol. 140, No. 5073, pp. 134-139, p. 177	Global	Market, Coloured diamonds
DS1987-0331 1987	Kane, R.E.	Three notable fancy color diamonds: purplish red,purple-pink and reddishpurple	Gems and Gemology, Vol. 23, No. 2, Summer, pp. 90-95	Brazil	Coloured diamonds
DS1989-0448 1989	Fritsch, E., Shigley, J.E.	Contribution to the identification of treated coloreddiamonds: diamonds with peculiar color zoned pavilions	Gems and Gemology, Vol. 25, No. 2, Summer pp. 95-101	Global	Diamond morphology, Coloured diamonds
DS1990-0465 1990	Federman, D.	Fancy pink diamond -jet-set pet rock	Modern Jeweler, No. 3, March p. 40	Australia	News item, Pink diamonds
DS1990-1348 1990	Shigley, J.E., Fritsch, E.	Optical properties of some natural color and laboratory treated color type1A green diamonds	International Mineralogical Association Meeting Held June, 1990 Beijing China, Vol. 2, extended abstract p. 687-688	Global	Diamond morphology, Green diamonds
DS1991-0905 1991	Koivula, J.I., Kammerling, R.C.	Diamonds -colored diamonds at Tucson mineral show	Gems and Gemology, Gem News, Vol. XXVII, Spring p. 46	Global	News item, Coloured diamonds
DM1992-1787 1992	Diamond International	Diamonds for connoisseurs	Diamond International, November/December pp. 56-65	Global	Coloured diamonds, Market
DS1992-0491 1992	Fritsch, E., Scarratt, K.	Natural color nonconductive gray to blue diamonds	Gems and Gemology, Notes and new techniques, Vol. 28, Spring pp. 35-42	Global	Diamond, Morphology, colour
DS1992-0526 1992	Gems & Gemology	Treated color diamonds with natural radiation stains	Gems and Gemology, Diamond laboratory Notes, Vol. 27, No. 4, pp. 249	Global	Diamond morphology, Diamond colour
DS1993-0496 1993	Gem Trade Lab Notes	Brown-pink diamond with green graining	Gems and Gemology, Gem Trade Notes, Vol. 29, Fall, pp. 198-199.	Global	Diamond morphology, Colour
DS1993-0497 1993	Gem Trade Lab Notes	Light violet-gray diamond	Gems and Gemology, Gem Trade Notes, Vol. 29, Fall, pp. 199.	Global	Diamond morphology, Colour
DS1993-0498 1993	Gem Trade Lab Notes	Treated green diamond with a blue colour zone	Gems and Gemology, Gem Trade Notes, Vol. 29, Fall, pp. 200.	Global	Diamond morphology, Colour
DS1993-1118 1993	Nelson, J.B.	The glass filling of diamonds. Part 1. an explanation of the colourflashes.	Journal of Gemology, Vol. 23, No. 8, October pp. 461-472.	Global	Diamond morphology, Colour
DS1994-0595 1994	Gems & Gemology	Near colorless Russian synthetic diamond examined	Gems and Gemology, Vol. 30, Summer pp. 123, 124.	Russia	Diamond color, Synthetic diamonds
DS1995-1735 1995	Shigley, J.E.	A chart for the separation of natural and synthetic diamonds	Gems and Gemology, Vol. 31, Winter pp. 256-264.	Global	Diamond -synthetics, Diamond chart -classification, colour
DS1995-1895 1995	Testa, A.	Roses are red... diamonds are too	Australian Gold Gem and Treasure, Dec. p. 21.	Global	Diamond colour
DM1995-2928 1995	Town and Country	Change of heart... green diamonds changing colour	Town and Country Magazine, p. 44.	Angola	News item, Diamond colour
DS1995-2108 1995	You, C.F., Spivack, A.J., Gieskes, J.M., Rosenbauer	Experimental study of boron geochemistry: implications for fluid processes in subduction zones	Geochimica et Cosmochimica Acta, Vol. 59, No. 12, pp. 2435-2442	Global	Geochemistry - experimental, Boron
DS1996-0036 1996	Anovitz, L.M., Grew, E.S.	Mineralogy, petrology and geochemistry of boron: an introduction	Reviews in Mineralogy, Vol. 33, pp. 1-40	Global	Boron, Mineralogy
DS1996-0503 1996	Gems & Gemology Lab Notes	Different colors from the same rough	Gems and Gemology, Vol. 32, fall pp. 204-5.	Global	Diamond colours
DS1996-0504 1996	Gems & Gemology Lab Notes	Rare color: fancy intense pinkish orange	Gems and Gemology, Vol. 32, fall pp. 206.	Global	Diamond colours
DS1996-0505 1996	Gems & Gemology Lab Notes	A suite of treated color pink to purple diamonds	Gems and Gemology, Vol. 32, fall pp. 207-8.	Global	Diamond colours
DS1996-0831 1996	Leeman, W.P., Sisson, V.B.	Geochemistry of boron and its implications for crustal and mantleprocesses	Reviews in Mineralogy, Vol. 33, pp. 645-708	Mantle	Boron, Geochemistry
DS1996-1041 1996	Noll, P.D. Jr., Newsom, H.E., Ryan, J.G.	The role of hydrothermal fluids in the production of subduction zonemagmas: evidence from siderophile ..	Geochimica et Cosmochimica Acta, Vol. 60, No. 4, Feb. 1, pp. 587-628	Mantle	Geochemistry -chalcophile, boron, Subduction, magma, volcanics
DS1996-1236 1996	Ryan, J.G., Leeman, W.P., Morris, J.D., Langmuir, C.H.	The boron systematics of intraplate lavas: implications for crust and mantle evolution.	Geochimica et Cosmochimica Acta, Vol. 60, No. 3, Feb. pp. 415-422.	Mantle	Boron
DS1997-0028 1997	Anderson, B., Payne, J.	Absorption spectra of diamond	Gemstone Press, Spectroscope and Gemology, pp. 214-22.	Global	Diamond spectroscopy, History, colour
DM1997-1416 1997	Diamond International	Colour is tops... strong performance and preference	Diamond International, May June p. 35, 36.	United States	News item, Diamond colour
DM1997-1446 1997	Financial Post	Diamonds aren't always forever... Guillemards thought they owned two pink diamonds worth millions.	Financial Post, May 3, 3p.	Global	News item, Pink diamonds, De Beers
DS1997-0375 1997	Gemological Institute of America (GIA) Lab Notes	Diamond with " additional color".... rough with contrasting colors	Gems and Gemology, Vol. 33, Summer pp. 134-136.	Global	Diamond - color
DS1997-0379 1997	Gems & Gemology	Cathodluminescence of yellow diamonds	Gems and Gemology, Vol. 33, winter, pp. 298.	Global	Diamond - colour, Cathodluminescence
DM1998-1758 1998	Diamond News and South African Jeweller	The decade of colour.... defined niche in coloured diamonds	Diamond News and South African Jeweller, July pp. 15, 17.	Global	Diamond sales, Coloured diamonds
DS1998-0485 1998	Gemological Institute of America (GIA) Lab Notes	Diamond - color treated from orangy yellow to reddish purple....examination of before and after radiation.	Gems and Gemology, Fall pp. 213-4.	Global	Diamond - irradiation
DS2000-0328 2000	Gems & Gemology Lab Notes	Fancy white diamonds... rare ..	Gems and Gemology Lab Notes, Vol. 36, No. 2, Summer, p. 156.	Global	Diamond - colour
DS2000-0329 2000	Gems & Gemology Lab Notes	Blue, zoned diamond examined	Gems and Gemology Lab Notes, Vol. 36, No. 2, Summer, p. 156-7.	Global	Diamond - colour
DS2000-0812 2000	Reinitz, I.M., Buerki, P.R., Shigley, J.E., McClure	Identification of HPHT treated yellow to green diamonds. the saturated neon green colour is not only..	Gems and Gemology, Vol. 36, No. 2, Summer, pp. 128-37.	United States, Russia, Sweden	Diamond - GE, Novatek, treated, colour
DS2001-0202 2001	Collins, A.T.	The colour of diamond and how it may be changed	Journal of Gemology, Vol. 27, No. 6, pp. 341-59.	Global	Diamond - morphology, colour
DS2002-1098 2002	Moses, T.M., King, J.M., Wang, W., Shigley, J.E.	A highly unusual 7.34 carat fancy vivid purple diamond	Journal of Gemmology, Vol. 28, January 1, pp. 7-12.	Global	Diamond - morphology, colour
DM200412-2401 2003	Gem News International	A comparison of three historic blue diamonds. Hope, Blue Heart, Heart of Eternity.	Gems & Gemology, Vol. 39, Winter, p. 322-325.	Technology	Diamonds notable - blue
DS200412-0753 2004	Gurney, J.J., Hildebrand, P.R., Carlson, J.A., Fedortchouk, Y., Dyck, D.R.	The morphological characteristics of diamonds from the Ekati property, Northwest Territories, Canada.	Lithos, Vol. 77, 1-4, Sept. pp. 21-38.	Canada, Northwest Territories	Diamond morphology, colour
DM200412-2425 2004	Idex Magazine	Black and brown diamonds.	Idex Magazine, June 22, 2p.	Technology	Diamond - colors
DM200412-2426 2004	Idex Magazine	Coveting the colored... diamonds.	Idex Magazine, June 22, 2p.	Technology	Diamond - colors
DM200412-2427 2004	Idex Magazine	Yellow - the king of color.	Idex Magazine, June 22, 2p.	Technology	Diamond - colors, yellow
DM200412-2427 2004	Idex Magazine	Yellow - the king of color.	Idex Magazine, June 22, 2p.	Technology	Diamond - colors, yellow
DM200412-2428 2004	Idex Magazine	Shades of a desert rose.	Idex Magazine, June 22, 2p.	Technology	Diamond - colors, pink
DM200412-2428 2004	Idex Magazine	Shades of a desert rose.	Idex Magazine, June 22, 2p.	Technology	Diamond - colors, pink
DS200412-1375 2002	Moses, T.M., King, J.M., Wang, W., Shigley, J.E.	A highly unusual 7.34 carat fancy vivid purple diamond.	Journal of Gemmology, Vol. 28, January 1, pp. 7-12.	Technology	Diamond - morphology, colour
DS200512-0331 2005	Gems & Gemology	HPHT treated IIa yellow diamond.	Gems & Gemology, Vol. 41, 1, Spring p. 43-46.		Diamond - colour
DS200512-0332 2005	Gems & Gemology	Diamond - with body color possible affected by the 3H defect ( radiation).	Gems & Gemology, Vol. 41, 1, Spring p. 42-3.		Diamond - colour
DS200512-0387 2005	Hainschwang, T., Katrusha, A., Vollstaedt, H.	HPHT treatment of different classes of type I brown diamonds.	Journal of Gemmology, Vol. 29, 5-6, pp. 261-273.		Diamond - colour
DS200512-0691 2005	Massi, L., Fritsch, E., Collins, A.T., Hainschwang, T., Notari, F.	The amber centres and their relation to the brown colour in diamond.	Diamond and Related Materials, Vol. 14, 10, pp. 1623-1629.	Technology	Diamond color
DS200612-0082 2006	Bangert, U., Barnes, R., Hounsome, L.S., Jones, R., Blumenau, A.T., Briddon, P.R., Shaw, M.J., Oberg, S.	Electron energy loss spectroscopic studies of brown diamonds.	Philosophical Magazine, Vol. 86, no. 29/31, pp. 4757-4780.	Technology	Brown diamonds
DM200612-1924 2006	Diamonds.net	GIA to unveil authoritative book on coloured diamonds at symposium.	Diamonds.net, August 24, 1/2p. Cost $ 60.00 plus shipping)	Global	News item - book colored diamonds
DS200612-0415 2006	Fristch, E., Massi, L., Hainschwang, T., Collins, A.T.	The first color center related to the brown graining in type 1a natural diamonds.	International Mineralogical Association 19th. General Meeting, held Kobe, Japan July 23-28 2006, Abstract p.	Technology	Diamond H- colour
DS200612-0437 2005	Gems &.Gemology, Lab Notes	Strongly coloured natural type IIb blue diamonds.	Gems & Gemology, Vol. 41, 3, Fall, p.258-9..	Technology	Diamond - colour
DS200612-0438 2005	Gems &.Gemology, Lab Notes	Diamond dyed rough.	Gems & Gemology, Vol. 41, 3, Fall, p.257-258.	Technology	Diamond - colour
DS200612-0604 2006	Hounsome, L.S., Jones, R., Martineau, P.M., Fisher, D., Shaw, M.J., Briddon, P.R., Oberg, S.	Origin of brown coloration in diamond.	Physical Review Letters, Vol. 73, 12, pp. 125203 ( 8 pages)	Technology	Diamond - colour
DS200612-0831 2006	Liu, Y.	Universal color grading system ( colored stones and diamonds).	GIA Gemological Research Conference abstract volume, Held August 26-27, p. 9, 1/2p.	Technology	Diamonds - colour CIELAB
DS200612-1264 2006	Severmish, M.	Color communication: the analysis of color in gem materials. ( Color stones and diamonds).	GIA Gemological Research Conference abstract volume, Held August 26-27, p. 9, 1/2p.	Technology	Diamonds - colour, ICC
DS200612-1283 2006	Shigley, J.F.	HPHT treated colorless and colored gem diamonds.	International Mineralogical Association 19th. General Meeting, held Kobe, Japan July 23-28 2006, Abstract p.	Technology	Diamond - colour, annealing
DS200712-0160 2006	Ceulemans, T.	Statistical study of the performance and predictive value of color measurement instruments for Cape coloured rough diamonds.	Gems & Gemology, 4th International Symposium abstracts, Fall 2006, p.130. abstract only	Technology	Diamond colour
DM200712-1673 2007	Diamonds.net	Celebrating brown - once the rejects of the industry - brown diamonds are now adored.	Diamonds.net, June 1, 2p.	Australia	News item - Brown diamonds
DM200712-1674 2007	Diamonds.net	Natural diamond colour change process earns patent.	Diamonds.net, July 11, 1/4p.	Technology	News item - brownish color
DM200712-1675 2007	Diamonds.net	Natural diamond colour change process earns patent.	Diamonds.net, July 11, 1/4p.	Technology	News item - brownish color
DS200712-0283 2006	Eaton-Magana, S., Post, J.E., Walters, R.A., Heaney, P.J., Butler, J.E.	Fluoresence of fancy color natural diamonds.	Gems & Gemology, 4th International Symposium abstracts, Fall 2006, p.131-2. abstract only	Technology	Diamond colour - UV radiation
DS200712-0332 2007	Fritsch, E., Rondeau, B., Hainschwang, T., Quellier, M.H.	A contribution to the understanding of pink color in diamond: the unique historical Grand Cond.	Diamond and Related Materials, Vol. 16, 8, pp. 1471-1474.	Technology	Diamond - colour
DS200712-0333 2007	Fritsch, E., Rondeau, B., Hainschwang, T., Quellier, M-H.	A contribution to the understanding of pink colour in diamond: the unique, historical 'Grand Conde'.	Diamond and Related Materials, Vol. 16, 8, August pp.1471-1474.	Technology	Diamond colour
DM200712-2141 2006	Gems & Gemology	Prolonged change of color in pink diamond exposure to UV radiation persisted for two weeks.	Gems & Gemology, Lab notes, Vol. 42, 4, winter pp. 263-264.	Technology	Diamond colour
DM200712-2142 2006	Gems & Gemology	Diamond Unusually large fancy white diamond with whitish banding.	Gems & Gemology, Lab notes, Vol. 42, 4, winter pp. 262-263.	Technology	Diamond colour
DM200712-2202 2006	Idex Online	Australia - gems from down under. Opal and sapphires featured.	Idex Magazine, Nov. 3p.	Australia	News item - coloured stones
DS200712-0544 2006	King, J.M., Moses, T.M., Wang, W.	The impact of internal whitish and reflective graining on the clarity grading of D to Z color diamonds at the GIA laboratory.	Gems & Gemology, Vol. 42, 4, winter pp. 206-221.	Technology	Diamond colour, grading
DS200712-0547 2007	Kitawaki, H.	Gem diamonds: causes of colors (NDFCT 536).	New Diamond and Frontier Carbon Technology, Vol. 17, 3, pp. 119-126. Ingenta	Technology	Diamond colour
DS200712-0850 2006	Pope, S.	High pressure, high temperature (HPHT) diamond processing: what is this technology and how does it affect colour?	Gems & Gemology, 4th International Symposium abstracts, Fall 2006, p.120, abstract only	Technology	Diamond color
DS200712-0977 2007	Shen, A.H., Wang, W., Hall, M.S., Novak, S., McClure, S.F., Shigley, J.E., Moses, T.M.	Serenity coated colored diamonds: detection and durability.	Gems & Gemology, Vol. 43, 1, Spring pp. 16-34.	Technology	Fancy diamonds
DS200712-1003 2006	Smirnov, S., Ananyev, S., Kalinia, V., Vins, V.	Color grading of color enhanced natural diamonds: a case study of Imperial red diamonds.	Gems & Gemology, 4th International Symposium abstracts, Fall 2006, p.126-7. abstract only	Technology	Colour grading
DS200712-1070 2006	Tashey, T.E.Jr., Tahey, M.C.	A system to describe the face up color appearance of white and off white polished diamonds.	Gems & Gemology, 4th International Symposium abstracts, Fall 2006, p.142-3. abstract only	Technology	Diamond colour grading
DS200712-1099 2006	Underwood, T.	Digital color communications for gemstones with an exploration of applications within our industry.	Gems & Gemology, 4th International Symposium abstracts, Fall 2006, p.143. abstract only	Technology	Diamond colour grading
DS200812-0279 2008	Deijanin, B., Simic, D., Zaitsev, A., Chapman, J., Dobrinets, I., Widemann, A., Del Re, N., Middleton, T., Dijanin, E., Se Stefano, A.	Characterization of pink diamonds of different origin: natural ( Argyle, non-Argyle), irradiated and annealed, treated with multi-process, coated and synthetic.	Diamond and Related Materials, Vol. 17, 7-10, pp. 1169-1178.	Australia	Pink diamonds
DM200812-2228 2007	Diamonds.net.	Mozambique imposes ban on gem trade.	Diamonds.net, Dec. 10, 1/4p.	Africa, Mozambique	News item - coloured stones
DM200812-2491 2008	Idex Magazine	Show me the color. Natural fancy diamond hue collection.	Idex Magazine, August 3, 5p.	Global	Coloured diamonds
DM200812-2492 2008	Idex Magazine	Colorwise retail. Socializing business and entertaining trust.	Idex Magazine, August 3, 3p.	Global	Coloured diamonds, gemstones
DM200812-2500 2008	Idex Magazine	Machine over man: coloring grading technology.	Idex Magazine, July 14, 5p.	Technology	Diamonds - colour
DS200812-1176 2008	Titkov, S.V., Shigley, J.E., Breeding, C.M., Mineeva, R.M., Zudin, N.G., Sergeev, A.M.	Natural color purple diamonds from Siberia. Mir field.	Gems & Gemology, Vol. 44, 1, spring pp. 56-64.	Russia, Siberia	Diamond - purple
DM200912-1057 2009	Colored Stone Magazine	Fancy these: inside the diamond color rainbow. ( green, yellow, purple and pink).	Colored Stone Magazine, Vol. 22, 4, July/August pp. 14-23.	Global	Diamond - colours
DM200912-1058 2009	Colored Stone Magazine	Singing the blues.... history of Hope.	Colored Stone Magazine, Vol. 22, 4, July/August pp. 36-41.		Diamonds - blue
DM200912-1059 2009	Colored Stone Magazine	Techni-colors .. modern technology changes.	Colored Stone Magazine, Vol. 22, 4, July/August pp. 30-35.	Technology	Diamonds - coloured
DS200912-0131 2009	Cowing, M.D.	A place for CZ masters in diamond colour grading.	Journal of Gemmology, Vol. 31, 2-4, pp. 77-84.	Technology	Diamond colours
DM200912-1385 2009	Diamonds.net	Pink diamond treatment.	Diamonds.net, Feb. 1, 2p.	Technology	News item - coloured diamonds
DM200912-1704 2008	Diamonds.net	Rare red diamond on display at Los Angeles museum deemed priceless. Kazanjian Red.	Diamonds.net, Jan. 11, 1p.	Global	Diamonds notable - Kajanjian Red
DM200912-1735 2008	Diamonds.net	JVC launches essential guide to U.S. trade in color diamonds.	Diamonds.net, Dec. 23, 1p.	United States	News item - guide colour
DS200912-0220 2009	Fisher, D., Sibley, S.J., Kelly, C.J.	Brown colour in natural diamond and interaction between the brown related and other colour inducing defects.	Journal of Physics Condensed Matter, in press ( August)	Technology	Brown diamonds
DM200912-1808 2009	Gems & Gemology	Treated color pink diamonds.	Gems & Gemology Ebrief, Oct. 5, 1/8p.	Technology	Pink diamonds
DS200912-0309 2009	Holloway, G.	Blue fluoresence in diamonds.	Australian Gemmologist, Vol. 23, 9, 1p.	Technology	Diamond colour
DS200912-0380 2008	King, J.M., Geurts, R.H., Gilbertson, A.M., Shigley, J.E.	Color grading 'D-to-Z' diamonds at the GIA laboratory.	Gems & Gemology, Vol. 44, 4, pp. 296-321.	Technology	Diamond colours
DS200912-0456 2009	Lu, T., Odaki, T., Yasunaga, K., Uesugi, H.	A fancy reddish brown diamond with new optical absorption features.	Journal of Gemmology, Vol. 31, 2-4, pp. 73-76.	Technology	Diamond colour
DS200912-0691 2009	Shigley, J.E.	Coloured diamonds.	PDAC 2009, 1/2p.	Global	Diamonds - colours
DS201012-0226 2010	Gems & Gemology	Fancy vivid blue HPHT treated type IIb diamond.	Gems & Gemology Lab Notes, Vol. 46, 2, p. 141-142.	Technology	Diamond colour
DS201012-0227 2010	Gems & Gemology	Fancy vivid blue HPHT treated type IIb diamond.	Gems & Gemology Lab Notes, Vol. 46, 2, p. 141-142.	Technology	Diamond colour
DM201012-1794 2010	Idex Magazine	Tender loving: The Rio Tinto pink diamond tender.	Idex Magazine, April 28, 4p.	Australia	Argyle pink diamonds
DM201012-1821 2010	Idex Online	Sotheby's Hong Kong sale to include famed 5.16 ct Millenium Blue Diamond.	Idex Online, March 24, 1p.	Global	Diamonds notable - Millenium Blue
DM201012-2196 2010	National Post	Why it's worth - an estimated $ 8- 12$ million. Pink diamond.	National Post, Sept. 25, 1/2p.	Global	News item - pink diamond
DS201012-0570 2010	Payne, C., Bauer, R.	Differing causes of colour in diamonds.	The Australian Gemmologist, Vol. 24, 1,	Global	Diamond colours
DM201112-1994 2011	G & G eBrief	A rare fancy vivid purple diamond.	G & G Briefs, Oct. 4, 1/4p.	Technology	News item - diamond colour
DM201112-1996 2011	G & G eBrief	Pink diamond.... 21.73 ct. HPHT	G & G ebrief, Sept. 7, 1/4p.	Technology	News item - pink diamond
DM201112-2376 2011	Mining.com	A jaundiced view of the diamond market ( yellow diamonds featured at Christie's event)	Mining.com, Sept. 29, 1/2p.	Global	News item - diamond colour
DS201112-0722 2011	Nasdala, L.	Radio-coloration of diamond.	GIA International Symposium 2011, Gems & Gemology, Summer abstract p. 105.	Technology	Diamond color
DM201112-2565 2011	The Israeli Diamond Industry	Investing in fancy color diamonds.	israelidiamond.co.il, Sept. 5, 2p.	Global	News item - colour diamonds
DM201112-2566 2011	The Israeli Diamond Industry	Investing in fancy color diamonds.	israelidiamond.co.il, Sept. 5, 3p.	Technology	News item - coloured diamonds
DM201112-2582 2011	The Israeli Diamond Industry	Israel's fancy coloured diamond companies experience positive trend in 2010.	israelidiamond.co.il, Jan. 26, 2p.	Global	News item - diamond colour
DM201112-2583 2011	The Israeli Diamond Industry	Is it possible to detect color treatment in a diamond?	israelidiamond.co.il, August 8, 1p.	Technology	News item - diamond colour
DS201112-1082 2011	Vasilyev, E.	The nature of black coloration in gem quality diamonds.	GIA International Symposium 2011, Gems & Gemology, Summer poster abstract p. 135.	Technology	Diamond color
DS201112-1102 2011	Wang, W.	Review of diamond color treatment and its identification.	GIA International Symposium 2011, Gems & Gemology, Summer abstract p. 107.	Technology	Diamond color
DM201205-1328 2012	Edmonton Journal	Buyers for $ 2.5 million diamond as rare as the giant gems. 10 carat pink diamond	Edmonton Journal, April 13, 1p.	Global	News item - pink diamond
DM201207-1617 2012	The Israeli Diamond Industry	Fancy colored diamonds touted as investments.	israelidiamond.co.il, June 12, 1/4p.	Global	News item - coloured diamonds
DS201212-0013 2012	Almor, Y.	Who's afraid ofirradiated diamonds?	Hayashalom Magazine, No. 207, pp. 157-	Technology	Diamond - irradiation
DS201212-0100 2012	Byrne, K.S., Anslie, J.D., Chapman, J.G., Luiten, A.N.	Optically reversible photochromism in natural pink diamond.	Diamond and Related Materials, Vol. 30, pp. 31-36.	Technology	Diamond colour
DS201212-0195 2012	Farges, F., Vinson, J., Rehr, J.R., Post, J.E.	Spectroscopy of B doped diamonds: experiment vs. theory. Hope, Tavernier Blue, French Blue	emc2012 @ uni-frankfurt.de, 1p. Abstract	Technology	Diamond - colour
DS201212-0222 2012	G & G ebrief	Diamond basics: part 3: how color happens in diamonds.	G & G Brief, Vol. 4, 2, Nov. 14, 1/4p.	Technology	Diamond colour
DS201212-0225 2012	Gaillou, E.,Post, J.E., Rost, D., Butler, J.E.	Boron in natural type 11b blue diamonds: chemical and spectroscopic measurements.	American Mineralogist, Vol. 97, pp. 1-18.	Technology	Blue diamond
DS201212-0545 2012	Payne, C., Bauer, R.	Causes of colour in fancy white diamonds.	The Australian Gemmologist, Vol. 24, 9, Jan-Mar. pp.	Technology	Diamond - colour
DM201305-1577 2013	Diamond Investing News	Brown diamonds set to be the next big thing.	Diamond Investing News, April 1, 2p.	Global	News item - Brown diamonds
DM201306-1775 2013	Diamonds.net	NCDIA plans a brown diamond conference for October. GIA education centre National Color Diamond Association	Diamonds.net, May 22, 1/2p.	Global	News item - brown diamonds
DM201309-2308 2013	Rough-Polished	Sotheby's to auction rare blue diamond.	rough-polished.com, August 20, 1/4p.	Technology	News item - blue diamond
DM201310-2418 2013	Rough-Polished	What for were diamonds made coloured.	rough-polished.com, Sept. 4, 1/4p.	Technology	News item - diamond colors
DS201312-0287 2013	G & G ebriefs	Artificially irradiated brown diamond.	Gems & Gemology, 1/2p.	Technology	Diamond - colour
DS201312-0302 2013	Gem Lab Notes	Strong color zoning reflects complex growth environment… orangy brown type IA	Gems & Gemology, Lab notes p. 116.	Technology	Diamond - colour
DS201312-0341 2013	Guagliardo, P., Byrne, K.,Chapman, J.,Sudarshan, K., Samarin, S., Williams, J.	Positron annihilation and optical studies of natural brown type 1 diamonds.	Diamond and Related Materials, Vol. 37, pp. 37-40.	Technology	Brown diamonds
DS201312-0352 2013	Hainschwang, T., Fritsch, E., Notari, F., Rondeau, B., Katrusha, A.	The origin of color in natural C center bearing diamonds.	Diamond and Related Materials, Vol. 39, pp. 27-40.	Technology	Diamond colour
DS201312-0557 2013	Luo, Y., Breeding, C.M.	Fluorescence produced by optical defects in diamond: measurement, characterization, and challenges.	Gems & Gemology, Vol. 49, 2, Summer pp. 82-97.	Technology	Diamond colour - spectra
DS201312-0637 2013	Nasdala, L., Grambole, D., Wildner, M., Gigler, A.M., Hainschwang, T., Zaitsev, A.M., Harris, J.W., Milledge, J., Schulze, D.J., Hofmeister, W., Balmer, W.A.	Radio-colouration of diamond: a spectroscopic study.	Contributions to Mineralogy and Petrology, Vol. 165, pp. 843-861.	Africa, South Africa, Democratic Republic of Congo, South America, Brazil, Venezuela	Diamond - colour
DS201312-0809 2013	Shepherd, P.	Overview of presentation on colour in diamonds.	London Ontario Mineral and Gem Society, 1p. Abstract	Technology	Diamond - colour
DS201312-0813 2013	Shigley, J.E., Breeding, C.M.	Optical defects in diamond: a quick reference chart.	Gems & Gemology, Vol. 49, 2, Summer pp. 107-111.		Diamond colour - spectra
DM201403-1251 2014	Diamond Investing News	Rav Dhillon talks colored diamond sourcing, investing and jewelery.	Diamond Investing News, Feb. 6, 1p.	Technology	News item - coloured diamonds
DM201403-2480 2014	The Israeli diamond industry	Fancy diamond color grading.	israelidiamond.co.il, Feb. 2, 3p.	Technology	Diamonds - coloured
DM201412-1526 2014	Diamonds.net	Fancy color diamonds identified as stable, high growth alternative asset class.	Diamonds.net, Nov. 12, 1/4p.	Global	News item - coloured diamonds
DS201412-0260 2014	Gaillou, E., Rossman, G.R.	Color in natural diamonds: the beauty of defects.	Rocks and Minerals, Jan-Feb. pp. 66-75.	Technology	Diamond - colour
DS201412-0261 2014	Galillou, E., Post, J.E., Steele, A., Butler, J.E.	Constrains on highly strained pink diamonds by high spatial resolution FTIR and Raman mapping.	Geological Society of America Conference Vancouver Oct. 19-22, 1p. Abstract	Technology	Pink diamond colour
DS201412-0376 2014	Howell, D.	Pink colour in Type 1 diamonds: is deformation twinning the cause?	ima2014.co.za, Poster	Technology	Diamond - color
DM201412-2433 2014	Rough-Polished	Fancy colours remain a niche category for which awareness and demand is yet to be strongly created says Shantakumar.	rough-polished.com, Nov. 17, 1/4p.	Global	News item - coloured diamonds
DS201412-0808 2014	Shigley, J.E.	Causes of color in diamonds.	6 Simposio Brasileiro de Geologia do Diamante, Aug. 3-7, 1p. Abstract	Technology	Diamond colour
DM201412-2534 2014	The Israeli Diamond Industry	New price index shows pink diamonds have the biggest growth among fancy colored.	israelidiamond.co.il, Nov. 13, 1/4p.	Technology	News item - pink diamonds
DM201503-1102 2015	Rough-Polished	Fancy coloured diamond index reflects stable prices in Q4 2014.	rough-polished.com, Feb. 19, 1/4p.	Global	News item - colored diamonds
DM201503-1348 2015	The Israeli Diamond Industry	The mystery that still baffles scientists: what makes pink diamonds pink?	israelidiamond.co.il Blog Stonehicky, Jan. 1, 1/4p.	Australia	News item - pink diamonds
DS201503-0180 2015	Titkov, S.V., Mineeva, R.M., Zudina, N.N., Sergeev, A.M., Ryabchikov, I.D., Shiryaev, A.A., Speransky, A.V., Zhikhareva, V.P.	The luminescent nature of orange coloration in natural diamonds: optical and EPR study.	Physics and Chemistry of Minerals, Vol. 42, 2, pp. 131-144.	Technology	Diamond Colour
DS201506-0295 2015	Shigley, J.E., Breeding, C.M.	Visible absorption spectra of colored diamonds.	Gems & Gemology, Vol. 51, 1, pp. 41-43.	Technology	Coloured diamonds
DS201507-0311 2015	Even-Zohar, C.	Temporary color enhancement: a potential game changer for industry and grading labs.	Diamond Intelligence Briefing ( Courtesy of Chaim), Vol. 30, no. 857, May 28, 8p.	Technology	Diamond - colours
DS201508-0354 2015	Even-Zohar, C.	Temporary colour enhancement …. Treatment, story so far, timing, legal and commercial problems of dishonesty.	Idex Magazine, No. 303, July pp. 36-62.	Technology	Diamond color enhancement
DM201509-0750 2015	Diamonds.net	Blue diamonds drive color index higher in 2Q. Fancy Color diamond index ( FCDI tm)	Diamonds.net, Aug. 25, 1/4p.	Global	News item - Blue diamonds
DM201510-2043 2015	Idex Memo	Betting on color…. Minion yellow.	Idexonline, Sept. 24, 1p.	Technology	News item - diamond colour
DS201511-1866 2014	Payne, C., Bauer, R.	Differing causes of colour in diamonds.	Australian Gemmologist, Vol. 24, 1, pp. 15-16.	Technology	Diamond colour
DS201603-0374 2016	Eaton-Magana, S.C., Moe, K.S.	Temperature effects on radiation stains in natural diamonds.	Diamond and Related Materials, in press available 29p.	Technology	Green diamonds
	Abstract: The green coloration of natural diamonds typically results from exposure to natural irradiation. This creates the GR1 optical center and in many diamonds, surficial damage, principally due to alpha radiation, which helps verify natural origin. In this study, 13 naturally irradiated diamonds with pronounced radiation stains were stepwise annealed from 200 °C to 1400 °C and the changes in color and defects were documented by photomicrography and spectroscopy. Additionally 3 diamonds were subjected to isothermal annealing at 550 °C. The radiation stains correlated with radiation-damage Raman peaks — a broad and shifted diamond Raman peak and radiation-related peaks at 1500 and 1640 cm? 1. The color transitioned from green to brown after heating to 550-600 °C and the stains were essentially decolorized at 1400 °C. Confocal Raman depth profiling showed that the depth penetration of the radiation stain was about 10-15 ?m into the diamond and this depth profile was distinctly different from depth profiles of ion-irradiation stains generated in a laboratory.
DM201603-0573 2016	Rough-Polished	Fancy color diamond prices stable year on year following turnaround for yellow diamonds in Q4.	rough-polished.com, Feb. 15, 1/4p.	Global	News item - coloured diamonds
DM201606-1184 2016	Ehud Arye Laniado	All about fancy coloured diamonds: introduction.	[email protected], May 25, 4p.	Technology	News item - colored diamonds
DM201607-2566 2016	Ehud Arye Laniado	All about color diamonds.	info@laniado, June 1, 4p.	Technology	News item - colour diamonds
DM201607-2569 2016	Ehud Arye Laniado	The growing rareness of pink diamonds.	info@laniado, June 15, 7p.	Australia	News item - pink diamonds
DM201607-2571 2016	Ehud Arye Laniado	Green diamonds - unique and challenging.	info@laniado, June 22, 6p.	Technology	News item - green diamonds
DM201607-1539 2016	Rough-Polished	Fancy color diamond book set to transform the diamond buying process.	rough-polished.com, June 29, 1/4p.	Technology	News item - colour diamonds
DM201608-1510 2016	Ehud Arye Laniado	Champagne, cognac, chocolate and brandy: how the industry markets brown diamonds.	info @laniado.com, July 6, 4p.	Global	News item - champagne diamonds
DM201608-1511 2016	Ehud Arye Laniado	Gray diamonds.	info @laniado.com, July 13, 2p.	Technology	News item - gray diamonds
DM201609-1767 2016	Diamonds.net	Blue diamonds buoy fancy color prices.	Diamonds.net, Aug. 15, 1/4p.	Technology	News item - Blue diamonds
DM201609-1776 2016	Ehud Arye Laniado	Fancy color diamond price direction.	info @ehudlaniado.com, Aug. 15, 6p.	Technology	News item - color prices
DM201609-1781 2016	Idex Magazine	A bumper year for colored diamonds at auction.	Idex Magazine, Vol. 30, 316, Aug. pp. 26-34.	Global	News item - coloured diamonds
DS201610-1900 2016	Post, J.E., Gaillou, E., Butler, J.E., Byrne, K.S.	Investigations into the luminescence properties and compositions of colored diamonds. ( blue and pink)	GSA Annual Meeting, 1/2p. abstract	Technology	Coloured diamonds
	Abstract: The Smithsonian’s National Gem Collection includes the Hope Diamond and an assortment of other significant fancy-colored diamonds, providing a unique opportunity to conduct detailed and sustained studies on an unprecedented selection of these rare and valuable stones. We present an overview and recent results from our work on pink, blue and chameleon diamonds. Boron causes the blue color of the Hope Diamond and other type IIb diamonds, but scarcity, high value, and the low concentration of B has inhibited B analyses of natural IIb diamonds. We used FTIR and ToF-SIMS to measure concentrations and distributions of B in the Hope and other blue diamonds. ToF-SIMS analyses gave spot B concentrations as high as 8.4 ± 1.1 ppm for the Hope Diamond to less than 0.08 ppm in other blue diamonds and revealed strong zoning of B in some diamonds, which was confirmed by mapping using synchrotron FTIR. Boron is also responsible for the phosphorescence emissions of IIb diamonds, at 660 nm and 500 nm; the emissions are likely caused by donor-acceptor pair recombination processes involving B and other defects. Approximately 50 type I natural pink diamonds were compared using UV-Vis, FTIR, and CL spectroscopies. All stones exhibit pink color zoning, ~1µm thick [111] lamellae, in otherwise colorless diamond. The pink diamonds fall into two groups: 1) those from Argyle in Australia and Santa Elena in Venezuela, and 2) those from other localities. TEM imaging from FIB sections revealed that twinning is the likely mechanism by which plastic deformation is accommodated for the pink diamonds. The deformation creates new centers, including the one responsible for the pink color, which remains unidentified. The differences in the plastic deformation features for the two groups might correlate to the particular geologic conditions under which the diamonds formed. Fluorescence and thermoluminescence experiments on natural chameleon diamonds reveal that an emission band, peaking near 556nm, may be stimulated via a number of different mechanisms. We discuss the implications of our observations for the electronic structure of the 556nm-fluorescing defect center, and the connections to the unidentified color center responsible for chameleon color changes.
DM201612-2404 2016	Idex online	Demand for natural blue diamonds drives color stone price in Q3.	Idexonline, Nov. 10, 1/4p.	Technology	News item - Blue diamonds
DM201701-0161 2016	The Israeli Diamond Institute	Rare and special: 8 fascinating facts about natural purple diamonds. Hydrogen	israelidiamond.co.il, Dec. 23, 1p.	Technology	News item - colour
DS201705-0827 2017	Gaillou, E., Rossman, G.R.	On the Beauty of Defects.	lithographie.org, No. 19, pp. 40-53.	Technology	Book - diamond colour
	Abstract: Extensive study has shown that these inclusions contain mantle-derived fluids (e.g. Navon et al., 1988, Izraeli et al., 2001, 2004 Tomlinson et al., 2009; Logvinova et al., 2011; Zedgenizov et al., 2011; Smith et al., 2012, Smith et al., 2015 Howell et al., 2012b Howell et al., , 2013 Weiss et al., 2013 Weiss et al., , 2015 Rakovan et al., 2014; Smit et al., in press), Here we use the term 'milky' to describe diamonds that contain zones of opalescent to brown or grey opaque appearance (Gaillou and Rossman, 2014). The exact cause of this opacity is yet to be defined, and forms the purpose of this paper.
DM201705-1015 2017	Rough-polished	Fancy colour diamond price index slightly up in Q1 2017.	rough-polished.com, April 29, 1/4p.	Global	News item - fancy color
DM201706-1173 2017	Geology In	Pink diamond mystery solved: what makes pink diamonds pink?	geologyin.com, May 5, 1p.	Technology	News item - pink diamonds
DM201803-0516 2018	Diamonds.net	Blues up, pinks down in 2017 index. Yellow diamonds dip, but still better than previous year.	diamonds.net, Feb. 5, 1/4p.	Global	News item - blue diamonds
DS201804-0675 2018	Breeding, M.	Diamond defects, diamond colour treatment, and its identification.	4th International Diamond School: Diamonds, Geology, Gemology and Exploration Bressanone Italy Jan. 29-Feb. 2nd., pp. 11-13. abstract	Technology	diamond -color centers
DM201805-1052 2018	Diamonds.net	Rosy future: investing in pink diamonds. Argyle	diamonds.net, Apr. 11, 3p.	Australia	News item - pink diamonds
DS201806-1214 2018	Breeding, C.M., Eaton-Magana, S., Shigley, J.E.	Natural color green diamonds: a beautiful conundrum.	Gems& Gemology, Vol. 54, 1, spring pp. 2-27.	South America, Brazil, Venezuela, Guyana	diamonds - green review
	Abstract: Among fancy-color diamonds, natural-color green stones with saturated hues are some of the rarest and most sought after. These diamonds are colored either by simple structural defects produced by radiation exposure or by more complex defects involving nitrogen, hydrogen, or nickel impurities. Most of the world’s current production of fine natural green diamonds comes from South America or Africa. Laboratory irradiation treatments have been used commercially since the late 1940s to create green color in diamond and closely mimic the effects of natural radiation exposure, causing tremendous difficulty in gemological identification. Compounding that problem is a distinct paucity of published information on these diamonds due to their rarity. Four different coloring mechanisms—absorption by GR1 defects due to radiation damage, green luminescence from H3 defects, and absorptions caused by hydrogen- and nickel-related defects—can be identified in green diamonds. Careful microscopic observation, gemological testing, and spectroscopy performed at GIA over the last decade allows an unprecedented characterization of these beautiful natural stones. By leveraging GIA’s vast database of diamond information, we have compiled data representative of tens of thousands of samples to offer a look at natural green diamonds that has never before been possible.
DM201808-1841 2018	Diamonds.net	NCDIA releases video on yellow diamonds.	diamonds.net, July 2, 1/4p.	Global	News item - NCDIA
DS201809-2005 2017	Cassette, P., Notari, F., Lepy, M-C., Caplan, C., Pierre, S., Hainschwang, T., Fritsch, E.	Residual radioactivity of treated green diamonds.	Applied Radiation and Isotopes, Vol. 126, 1, pp. 66-72.	Global	diamond - green
	Abstract: Treated green diamonds can show residual radioactivity, generally due to immersion in radium salts. We report various activity measurements on two radioactive diamonds. The activity was characterized by alpha and gamma ray spectrometry, and the radon emanation was measured by alpha counting of a frozen source. Even when no residual radium contamination can be identified, measurable alpha and high-energy beta emissions could be detected. The potential health impact of radioactive diamonds and their status with regard to the regulatory policy for radioactive products are discussed.
DM201809-2161 2018	Diamonds.net	Blue leads fancy coloured prices.	diamonds.net, Aug. 6, 1/4p.	Global	News item - blue diamonds
DS201809-2017 2018	Eaton-Magana, S., Breeding, C.M., Shigley, J.E.	Natural color blue, gray, and violet diamonds: allure of the deep.	Gems & Gemology, Vol. 54, 2, pp. 112-131.	Africa, South Africa, Australia	diamond - colour
	Abstract: Natural-color blue diamonds are among the rarest and most valuable gemstones. Gray and violet diamonds are also included here, as these diamonds can coexist on a color continuum with blue diamonds. More so than most other fancy colors, many diamonds in this color range are sourced from specific locations-the Cullinan mine in South Africa and the Argyle mine in Australia. Although blue color is often associated with boron impurities, the color of diamonds in this range (including gray and violet) also originates from simple structural defects produced by radiation exposure or from more complex defects involving hydrogen. These different mechanisms can be characterized by absorption and luminescence spectroscopy. A fourth mechanism-micro-inclusions of grayish clouds or tiny graphite particles in gray diamonds-can be distinguished through microscopy. In this article, we summarize prior research as well as collected data such as color and carat weight on more than 15,000 naturally colored blue/gray/violet diamonds from the GIA database (along with an analysis of spectroscopic data on a subset of 500 randomly selected samples) to provide an unprecedented description of these beautiful gemstones.
DS201809-2030 2018	Green, C.	The pursuit of colour. Part 1. The rise to prominence of fancy coloured diamonds post 1970.	The Australian Gemmologist, Vol. 26, 9-10, pp. 226-239.	Global	diamond - colour
DM201810-2431 2018	Diamonds.net	Rosy outlook: Christie's ten history making pink diamonds sold at Christie's.	diamonds.net, Sept. 12, 1/4p.	Global	News item - pink diamonds
DS201811-2569 2018	Ekimov, E.A., Sidorov, V.A., Maslakov, K.I., Sirotinkin, B.P., Krotova, M.D., Pleskov, Yu.V.	Influence of growth medium composition on the incorporation of boron in HPHT diamond.	Diamond & Related Materials, Vol. 89, pp. 101-107.	Mantle	boron
	Abstract: Influence of growth medium composition on the efficiency of boron doping of carbonado-like diamond at 8-9 GPa was studied by diluting the C-B growth system with metallic solvents of carbon, Co and Ni. Addition of these metals to the original system leads to a decrease in the synthesis temperature, degree of doping with boron and suppression of superconductivity in diamond. According to XPS analysis, content of substitutional boron is equal to 0.07, 0.16 and 0.39 at.% in diamonds obtained in Co-C-B, Ni-C-B and C-B growth systems, respectively. Metallic behavior at normal temperatures and superconductivity below 5 K in diamond, synthesized in C-B system, change to semiconducting character of conductivity down to 2 K in diamonds obtained in the diluted systems; a faint hint of superconducting transition at 2 K was detected in the case of diamond grown in Ni-C-B system. By comparing phase composition of the inclusions and the doping efficiency of the diamonds, we are able to suggest that high chemical affinity of boron to boride-forming metals hinders the boron doping of diamond. The heavily boron-doped carbonado-like diamond compacts demonstrate high electrochemical activity in aqueous solutions and can be used as miniature electrodes in electrosynthesis and electroanalysis.
DM201811-2730 2018	South China Morning Post	Will green diamonds become a China investor's best friend?	southchinamorningpost.com, Oct. 8, 1/2p.	China	News item - green diamonds
DM201812-2956 2018	Diamonds.net	Prices rise for pink and blue diamonds.	diamonds.net, Nov. 1, 1/4p.	Global	News item - pink diamonds
DS201901-0009 2018	Breeding, C.M.	Colored diamonds: the rarity and beauty of imperfection.	Gems & Gemology, Sixth International Gemological Symposium Vol. 54, 3, 1p. Abstract p. 275.	Global	diamond color
	Abstract: Diamond is often romanticized as a symbol of purity and perfection, with values that exceed all other gemstones. However, even the most flawless and colorless natural diamonds have atomic-level imperfections. Somewhat ironically, the rarest and most valuable gem diamonds are those that contain abundant impurities or certain atomic defects that produce beautiful fancy colors such as red, blue, or green—stones that can sell for millions of dollars per carat. Atomic defects can consist of impurities such as nitrogen or boron that substitute for carbon atoms in the diamond atomic structure (resulting in classifications such as type Ia, type Ib, type IIa, and type IIb) or missing or misaligned carbon atoms. Some defects are created during diamond growth, while others are generated over millions to billions of years as the diamond sits deep in the earth at high temperatures and pressures. Defects may be created when the diamond is rapidly transported to the earth’s surface or by interaction with radioactive fluids very near the earth’s surface. Each defect selectively absorbs different wavelengths of light to produce eye-visible colors. Absorptions from these color-producing defects (or color centers) are detected and identified using the gemological spectroscope or more sensitive absorption spectrometers such as Fouriertransform infrared (FTIR) or ultraviolet/visible/near-infrared (UV-Vis-NIR; figure 1). Some defects not only absorb light but also produce their own luminescence, called fluorescence. For example, the same defect that produces “cape” yellow diamonds also generates blue fluorescence when exposed to ultraviolet light. In some cases, the fluorescence generated by defects can be strong enough to affect the color of gem diamonds. With the exception of most natural white and black diamonds, where the color is a product of inclusions, colored diamonds owe their hues to either a single type of defect or a combination of several color centers. More than one type of defect can produce a particular color, however. Table 1 provides a list of the most common causes of color in diamond. Subtle differences in atomic defects can drastically affect a diamond’s color. For example, isolated atoms of nitrogen impurities usually produce strong yellow color (“canary” yellow diamonds). If those individual nitrogen atoms occur together in pairs, no color is generated and the diamond is colorless. If instead the individual nitrogen atoms occur adjacent to missing carbon atoms (vacancies), the color tends to be pink to red. Rearrangement of diamond defects is the foundation of using treatments to change the color of diamond. Identification of treatments and separation of natural and synthetic diamond requires a thorough understanding of the atomic-level imperfections that give rise to diamond color and value.
DS201901-0011 2018	Butler, J.E., Byrne, K.S., Wang, W., Post, J.E.	Complex charge transfer in chameleon diamonds: a model of the color-change process,	Gems & Gemology, Sixth International Gemological Symposium Vol. 54, 3, 1p. Abstract p. 303.	Global	diamond color
	Abstract: A group of natural diamonds known as chameleon diamonds change color from green to yellow based on their exposure to light and heat. These diamonds also emit long-lived phosphorescence after UV excitation. We have observed the optical response of these diamonds to optical and thermal excitation and developed a model to explain the observed phenomena. A principal element of the model is the proposal of an acceptor state (figure 1), which should be observable in the near-infrared (NIR) region. Subsequently, we have observed the NIR absorption to this acceptor state, supporting our model of charge-transfer processes in these diamonds.
DS201901-0019 2018	Cohen, H., Ruthstein, S.	Evaluating the color and nature of diamonds via EPR spectroscopy.	Gems & Gemology, Sixth International Gemological Symposium Vol. 54, 3, 1p. Abstract p. 276.	Global	diamond color
	Abstract: Diamond characterization is carried out via a wide variety of gemological and chemical analyses. An important analytical tool for this purpose is spectroscopic characterization utilizing both absorption and emission measurements. The main techniques are UV-visible and infrared spectroscopy, though Raman as well as cathodoluminescence spectroscopy are also used. We have used electron paramagnetic resonance (EPR) spectroscopy to compare the properties of treated colored diamonds to the pretreated stones. The colors studied were blue, orange, yellow, green, and pink. The EPR technique determines radicals (atoms with unpaired electrons) and is very sensitive, capable of measuring concentrations as low as ~1 × 10–17 radicals/cm3. The results, shown in table 1, indicate that all the carbon radicals determined are affected by adjacent nitrogen atoms, with the spectra showing a hyperfine structure attributed to the presence of nitrogen. The highest concentration of radicals and hyperfine structures is observed in pink and orange treated diamonds. The results concerning nitrogen concentration were correlated with the infrared spectra, which determine the absorption peaks of the diamonds as well as those of the nitrogen contamination in their crystal structure.
DS201901-0049 2018	Odake, S.	Melee diamonds: metal defects and treated color.	Gems & Gemology, Sixth International Gemological Symposium Vol. 54, 3, 1p. Abstract p. 304.	Global	diamond color
	Abstract: Gem-quality laboratory-grown diamonds are manufactured in large quantities. With frequent reports of the mixing of meleesized synthetic diamonds with natural stones, demand for melee diamond screening is increasing. During melee diamond screening at GIA’s Tokyo lab, two notable types of samples with uncommon characteristics have been found. 1. Natural melee diamonds with silicon and nickel defects. Luminescence peaks derived from Si- and Ni-related defects are often observed in colorless melee grown by the HPHT method. The silicon-related defect, once considered proof of CVD-grown diamond, is now known to exist naturally as well (Breeding and Wang, 2008). Several colorless melee diamonds having both silicon- and nickel-related emissions have been found in GIA’s Tokyo lab; olivine inclusions were found in one of these samples. Spectroscopic and gemological features confirmed that the samples were grown in nature. 2. Irradiated laboratory-grown diamond melee found among irradiated natural melee diamonds. Several thousand greenish blue melee diamonds have been submitted by various clients to the Tokyo lab for testing. Each diamond’s color was attributed to a strong GR1 defect caused by irradiation treatment. Fourier-transform infrared (FTIR), photoluminescence (PL), and DiamondView analysis revealed that most of them were irradiated natural diamonds. Eight were irradiated CVD-grown diamonds, and one was an irradiated HPHT-grown specimen. The infrared spectrum of all the CVD samples showed a peak at 3123 cm-1, while their PL spectrum showed a doublet peak at 596/597 nm. Those peaks are specific to as-grown CVD diamonds, as annealing removes the peaks. From their spectra, these CVD specimens were considered irradiated without pre-annealing.
DS201901-0074 2018	Serov, R.	Quantitative absorption spectrum reconstruction for polished diamond.	Gems & Gemology, Sixth International Gemological Symposium Vol. 54, 3, 1p. Abstract p. 276-7.	Global	diamond color
	Abstract: Natural diamonds generally exhibit a very wide range of spectra. In polished stones, absorption along with proportions and size define perceived diamond color and thus beauty. In rough diamonds, the quantitative absorption spectrum (the “reference spectrum” in the context of this article) can be measured using an optical spectrometer through a set of parallel windows polished on a stone, so the diamond can be considered a planeparallel plate with known thickness. Polished diamonds lack the parallel facets that might allow plane-parallel plate measurement. That is why polished diamond colorimetry uses one of two approaches that have certain limitations for objective color estimation: 1) Qualitative spectrum assessment with an integrating sphere. Suppose three diamonds are polished from a yellow rough with even coloration: a round (with short ray paths), a cushion (with high color uniformity and long ray paths), and a “bow tie” marquise (with both long and short ray path areas). The spectra captured from these three stones by an integrating sphere will be completely different because the ray paths are very different. However, the quantitative absorption spectrum will be the same for all three stones, since they are cut from the same evenly colored rough. Therefore, spectrum assessment with an integrating sphere has very limited accuracy and is practical for qualitative estimations only. 2) Analysis of multiple images of a diamond made by color RGB camera. This method has low spectral resolution defined by digital camera color rendering. The camera has a smaller color gamut than the human eye, so most fancycolor diamonds are outside the color-capturing range of a digital camera. However, quantitative absorption data is very valuable for: 1) Color prediction and optimization for a new diamond after a recut process 2) Objective color assessment and description of a polished diamond This paper presents a new technology based on spectral lightemitting diodes (LEDs) and high-quality ray tracing, which together allow the reconstruction of a quantitative absorption spectrum for a polished diamond. The approach can be used for any transparent polished diamond. The recent technology prototype has a resolution of 20–60 nm, which is practical for color assessment. Figure 1 (top) presents three photorealistic diamond images: A is based on the reconstructed absorption spectrum collected from a polished diamond, B uses the reference spectrum collected in the rough stage through a pair of parallel windows, and C uses the averaged reference spectrum. Figure 1 (bottom) shows both measured quantitative absorption and reconstructed absorption spectra. This technology has the potential to ensure very close to objective color estimation for near-colorless and fancy-color polished diamonds. The reconstructed spectrum resolution can be enhanced to 10–15 nm in future devices.
DM201902-0340 2019	Barrons	Colored diamonds expected to shine in 2019.	barrons.com, Jan. 4, 1p.	Global	News item - diamond colour
DM201902-0366 2018	Diamonds.net	Pink diamonds: how the pink diamond became one of the world's hottest gems.	newyorkpost.com, Dec. 31, 1/4p.	Global	News item - diamond colour
DS201903-0505 2018	Eaton-Magana, S., Ardon, T., Smit, K.V., Breeding, C.M., Shigley, J.E.	Natural color pink, purple, red and brown diamonds: band of many colors.	Gems & Gemology, Vol. 54, 4, pp. 352-377.	Global, Australia	diamond colour
	Abstract: Diamond is one of Earth’s most extraordinary materials. It represents the pinnacle for several material and physical properties. As a gem, however, it is the near-perfect examples—diamonds attaining the D-Flawless distinction—and those with imperfections resulting in a vibrant or surprising color that create the most enduring impressions. Fancy-color natural diamonds are among the most highly valued gemstones due to their attractiveness and great rarity. The 18.96 ct Winston Pink Legacy, with a color grade of Fancy Vivid pink, recently made history by selling at over $50 million, its $2.6 million per carat price an all-time high for a pink diamond (Christie’s, 2018).
DM201903-0587 2019	Ehud Arye laniado	Diamond industry Organizations: International Colored Gemstone Association.	info@ ehudlaniado.com , Feb. 20, 2p.	Global	News item - ICA
DS201903-0538 2018	Pay, D.	Pink diamonds and more	Gems & Gemology, Vol. 54, 4, p. 351.	Global	diamond color
DM201903-0671 2019	The Israel Diamond Industry	Pink diamonds win big in 2018.	israelidiamond.co.il, Feb. 1, 1/4p.	Global	News item - diamond colour
DS201905-1032 2014	Gaillou, E., Rossman, G.R.	Color in natural diamonds .. The beauty of defects. Note date ***	Rocks & Minerals, 12p.	Global	diamond colour
	Abstract: In its pure form, diamond is colorless. However, in nature (or even when made in laboratories), diamonds are never composed of 100 percent carbon atoms. Even colorless diamonds will contain some defects: missing carbon atoms or containing trace amounts of nitrogen or hydrogen, for example. When present in certain atomic arrangements and concentrations, most minor components cause absorption of specific wavelengths of light, giving rise to color. The color in diamond is not source specific, even if some mines are known to produce more of certain colors, such as blue diamonds from the Premiere mine in South Africa, or brown and pink diamonds from the Argyle mine in Australia. Virtually every single diamond mine could produce any kind of colored diamond. At auction, record prices for gems are currently held by pink and blue diamonds: for example, $2,155,332 per carat for a 24.78-carat Fancy vivid pink diamond (sold at Sotheby's in 2010) and $1.8 million per carat for a 5.3-carat Fancy deep blue diamond (sold at Bonhams in London in April 2013).
DS201907-1551 2019	Howell, D., Collins, A.T., Loudin, L.C., Diggle, P.L., D;Haenens-Johansson, U.F.S., Smit, K.V., Katrusha, A.N., Butler, J.E., Nestola, F.	Automated FTIR mapping of boron distribution in diamond. Type Ilb	Diamond and Related Materials, in press available 33p.	Global	DiaMap
	Abstract: Type IIb diamonds are those that contain more boron than nitrogen. The presence of this uncompensated boron gives rise to absorption in the infrared part of the electromagnetic spectrum, extending into the visible region and often resulting in blue colouration. Here we report on the expansion of the DiaMap freeware (for the automated spectral deconvolution of Type I [nitrogen containing] diamonds) to work on Type IIb diamonds, returning concentrations from three boron-related absorption bands, and determining which band provides the most reliable value. The program uses the calibration coefficients of Collins (2010), which show good relative agreement between the three bands, but might require some further study to confirm their absolute accuracy to the uncompensated boron concentration. The methodology of DiaMap_IIb is applicable to all Type IIb diamonds, both natural and synthetic. Analysis of high-resolution Fourier-transform infrared (FTIR) maps of two high-pressure high-temperature (HPHT) synthetic diamonds using DiaMap_IIb, confirm the growth sector dependence of the boron incorporation. Partitioning of boron strongly favours the octahedral {111} sectors.
DS201907-1575 2019	Smith, E.M., Shirey, S.B., Richardson, S.H., Nestola, F., Bullocks, E.S., Wang, J., Wang, W.	Reply to: Evidence for two blue (type Ilb) diamond populations. ( Moore and Helmstaedt Nature Vol. 570, E26-27.	Nature, Vol. 570, E28-29.	Mantle	boron
DM201908-1971 2019	The West Australian	Pink diamonds' price perk. Argyle	thewestaustralian.com, July 2, 1p.	Australia	News item - pink diamonds
DS202001-0018 2019	Huang, W., Ni, P., Shui, T., Shi, G.	Hydrogen rich green diamond color treated by multi step processing.	Gems & Gemology, Vol. 55, 3, pp. 398-405.	Global	diamond color
	Abstract: A cut diamond of intense yellowish green color has been characterized using microscopy and spectroscopic techniques. The diamond has been unambiguously identified as color-treated. The simultaneous presence of multiple centers related to irradiation and annealing—including H1a, H1b, NV0, NV-, H3, H4, GR1, and H2—was revealed. UV-Vis-NIR absorption spectroscopy showed that the diamond owes its color to the two major bands related to H3 and GR1. The combination of these spectroscopic features in one diamond has not been reported in the gemological literature, suggesting that this diamond was subjected to a complex treatment procedure that is not frequently applied. Taking into account the thermal stability of the defects involved and the defect transformations at high temperatures, two possible treatment procedures explaining the observed combination of spectroscopic features are proposed.
DS202003-0348 2020	Lee, C.W.Y., Cheng, J., Yium Y.C., Chan, K., Lau, D., Tang, W.C., Cheng, K.W,m Kong, T., Hui, T.K.C., Jelezko, F.	Correlation between EPR spectra and coloration of natural diamonds.	Diamond & Related Materials, Vol. 103, 13p. Pdf	Global	diamond colour
	Abstract: White diamonds color grading is one of the basic diamond evaluations. The color value based on a scale that ranges from D to Z, with D being the more colorless and more valuable, among other qualifications. As the diamond grade moves on this scale, its color appears more yellow progressively. This yellowish color, present only in Type I diamonds, is mainly due to the nitrogen related defects such as N3 center and C-center. The current color grading system is based on a visual method, where gemologist compares the sample with a Master Color set. However, this method is very subjective. Several defects responsible for light absorption in diamond are carrying electron spin and appear in Electron Paramagnetic Resonance (EPR) spectrum. In this study, we developed a new EPR based technique for a quantitative measurement of N3 center and C-center in diamond through quantitative EPR spectroscopy. The correlation between EPR spectra and color grades of diamond was established.
DS202003-0362 2020	Sha, X., Yue, W., Zhang, H., Qin, W., She, D., Wang, C.	Thermal stability of polycrystalline diamond compact sintered with boron coated diamond particles.	Diamond & Related Materials, in press available, 34p. Pdf	Global	boron
	Abstract: The polycrystalline diamond compact (PDC), which consists of a polycrystalline diamond layer on a tungsten carbide (WC)/cobalt (Co) substrate, is extensively utilized as drilling bits. However, the poor thermal stability due to the graphitization and oxygen susceptibility of diamond severely limits the application of PDCs to high-temperature drilling work. In this study, a new PDC with improved thermal stability is successfully synthesized with boron (B)-coated diamond particles, which forms a uniform boron carbide (B4C) barrier. The as-received B4C phase acts as a protective barrier, which enhances the initial graphitization and oxidizing temperatures to 800 °C and 780 °C, respectively, which are ~100 °C and ~30 °C higher than those (700 °C and 750 °C) of the PDC sintered with uncoated diamond particles. The B4C barrier protects diamond grains from direct contact with the Co phase, prohibiting the cobalt-catalytic graphitization. In addition, the oxidation of the B4C barrier occurs prior to that of the diamond grains, which inhibits the PDC from oxidation.
DM202008-1491 2020	Diamonds.net	NCDIA crates coloured diamond ambassador group.	diamonds.net, July 15, 1/4p.	Global	News item - NCDIA
DM202012-2262 2020	Australian Mining	Rio Tinto hosts second last Argyle diamonds tender. Argyle Eternity 2.24 carats fancy vivid purplish pink, 2.45 Argyle Ethereal, 1.84 ct Argyle Sakura, 0.43 Argyle Emrys, Argyle Skylar 0.33, Argyle Infinite 0.70 ct	Australianmining.com, Nov. 18, 1/3p.	Australia	News item - pink diamonds
DS202102-0196 2020	Hainschwang, T.	Wrestling with radiation ( diamonds)	Gems & Jewellery, Vol. 29, 4, pp. 28-41.	Global	diamond colour
DM202103-0452 2021	Diamonds.net	Fancy-color price index sees slight decline.	Diamonds.net, Feb. 15, 1/4p.	Global	News item - colour
DS202103-0377 2020	Eaton-Magana, S., Ardon, T., Breeding, C.M., Shigley, J.E.	Natural color D-to-Z diamonds: a crystal clear perspective.	Gems & Gemology, Vol. 56, 3, pp. 318-335. pdf	Global	diamond - colour
	Abstract: Colorless to light yellow or brown diamonds with a “D-to-Z” color grade make up the overwhelming majority of the world’s gem diamond trade. Besides clarity features (such as inclusions) and fluorescence observations, however, comparatively little has been explored and published regarding the distinguishing characteristics of these diamonds. The vast majority are type Ia, with infrared spectra showing very high concentrations of nitrogen aggregates. This population of diamonds could not have been subjected to HPHT decolorizing treatment or been laboratory grown, and thus they have been spectroscopically scrutinized in much less detail than the far more rare natural diamonds of types IIa, IIb, and IaB, which need to be investigated as potentially color-treated or synthetic. This study examines a large sample set comprising the full complement of D-to-Z diamonds submitted to GIA laboratories during a significant portion of 2017. The data were evaluated on the basis of diamond type properties, as well as distribution among various grading quality factors, to provide an unprecedented glimpse into the role of these diamond types and differences in their geologic conditions of formation.
DM202103-0509 2021	Rough-polished	FCRF report: minor decrease in fancy color diamond prices in 2020.	Rough-polished.com, Feb. 19, 1/4p.	Global	News item - colour
DS202104-0573 2021	Eaton-Magana, S., Ardon, T., Breeding, C., Shigley, J.	D-Z Diamonds ( Ardon presents the information from the article in Gems & Gemology **** see ref under Ahline same one…….	gia.org and knowledge session utube, March	Global	Diamond colour
	Abstract: Did you know that certain diamonds can temporarily change color when exposed to heat, ultraviolet light, or even when kept in the dark? Some natural greenish diamonds are known as “chameleon” diamonds due to this property. Other natural pink diamonds and some color-treated and laboratory-grown diamonds can also change color in unexpected ways. Before this phenomenon was known, there were stories of customers returning diamonds they purchased because the diamonds turned out to be the “wrong” color! What exactly causes these interesting diamonds to shift their hues? Find out as GIA senior manager of diamond research Dr. Ulrika D'Haenens-Johansson and senior research scientist Dr. Mike Breeding dive into the mystery of these ultra-cool gems.
DS202105-0778 2021	Muruganathan, M., Mizuta, H.	Boron vacancy color center in diamond: An initio study.	Diamond & Related Materials, Vol. 114, 108341 6p. Pdf	Global	diamond colours
	Abstract: The color centers in diamond are crucial for emerging single-photon sources, quantum technologies, and biological sensors. Even though boron is commonly used as a dopant for diamond, its functionality as a vacancy color center depends on the capability to excite electrons optically between the well-defined gap states. Here we show by using density functional theory calculations that the negatively charged boron-vacancy (BV?1) center in diamond possesses such well-isolated gap states and enables the spin-conserved triplet excitation. Formation energy of different charge states of boron vacancy center is calculated by including the corrections of electrostatic interactions between the periodic images of the charged defects and the defect-induced bands shift. Wavefunctions of diamond BV?1 center defect states are elucidated and its zero phonon line is calculated as 3.22 eV. These characteristics manifest that the BV?1 center can be harnessed as an alternative promising color center for diamonds.
DS202105-0786 2021	Razgulov, A.A., Lyanpin, S.G., Novikov, A.P., Ekimov, E.A.	Low-temperature photoluminescence study of SnV centers in HPHT diamond.	Diamond & Related Materials, Vol. 116, 108379 9p. Pdf	Global	diamond colours
	Abstract: Here we report on the study of temperature shift and broadening of the zero phonon line (ZPL) of SnV center in HPHT microcrystalline diamond in the temperature range of 80-300 K. To separate contributions of lattice thermal expansion and electron-phonon coupling, the study of the pressure effect on the ZPL was conducted. A strong nonlinearity observed in the electron-phonon part of the ZPL temperature shift appeared to be in good agreement with well-known polynomial law ?E(T) = cT^2-dT^4 and, therefore, can be related to the effect of the strong softening of elastic springs.
DM202106-1042 2021	Rough-polished	FCRF: fancy color diamond prices increase in Q1 2021.	roughpolished.com, May 14, 1/4p.	Global	News item - colour diamonds
DM202108-1352 2021	Diamonds.net	The enduring appeal of pink gemstones: from rosy-hued diamonds to sapphires.	The National Lifestyle, July 30, 6p.	Global	News item - pink diamonds
DS202108-1280 2021	Eaton-Magana, S., Johnson, P., Barrie, E., Harinova, M.	Bicolor rough diamond crystals. ( pink)	Gems & Gemology , Vol. 57, 1, pp. 53-55.	Australia	diamond colour
DM202111-1892 2021	The West Australian	Rio Tinto's Argyle diamond mine's closure fuelling bull run for rare pinks.	thewestaustralian.com, Oct. 27, 1/2p.	Australia	News item - pink diamonds
DM202111-1893 2021	UKNewstoday	Third kind of colour-changing diamond ( only changes if chilled to -320 deg F ( temperature of liquid nitrogen)	UKNewsToday.com, Oct. 7, 2p.	Global	News item - chameleon
DM202112-2014 2021	Idex Online	Christie's to sell Blue diamond at online auction. $ 675,000 high estimte.	idexonline.com, Nov. 17, 1/4p.	Europe, United Kingdom	News item - Blue diamond
DM202112-2049 2021	Rough-polished	FCRF: Fancy coloured diamonds price increases by 0.7% in Q3.	rough-polished.com, Nov. 9, 1/4p.	Global	News item - FRCF
DM202112-2081 2021	The Gothamist	A new exhibit at the American Museum of Natural History showcases a rare 20 carat blue diamond from Botswana. Okavango	thegothamist.com, Nov. 12, 1/4p.	Africa, Botswana	News item - Okavango Blue