The Argyle diamond mine is the only known source of type IaB hydrogen- and nitrogen-rich diamonds coloured grey to blue to violet.
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Pink CVD lab-grown products can be separated from natural and treated-colour natural pink diamonds by a combination of gemmological and spectroscopic properties, which are explored in this study.
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Knowledge of type allows gemmologists to better evaluate if a diamond might be treated or synthetic, and whether it should be sent to a laboratory for testing.
Read MoreHigh-quality synthetic diamonds created by the Gemesis Corp. are examined and their gemmological properties are explicated.
Read MoreDe Beers has produced a faceted synthetic gem-quality diamond that could go unrecognised without careful gemmological testing.
Read MoreSumitomo Electric Industries is producing gem-quality synthetic yellow diamonds in deep yellow single crystals in sizes up to 2 ct.
Read MoreGreenish yellow to yellowish green HPHT-treated diamonds exhibited highly saturated body colour, well-defined brown to yellow octahedral graining and visual evidence of heating, among other characteristics.
Read MoreThis article compares some of Chatham Created Gems’ synthetic coloured diamonds to natural diamonds and explains the results.
Read MoreRussian-grown gem-quality synthetic diamonds are being sold for jewellery; this article presents the results of a gemmological examination of a group of yellow samples.
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