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0.45 ct Pink CVD Labgrown Diamond
Strongly Coloured Pink CVD Lab-Grown Diamonds

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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Coloured Diamonds in the Aurora Butterfly of Peace Collection
The “Type” Classification System of Diamonds and Its Importance in Gemmology

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.

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Lab-Grown Coloured Diamonds from Chatham Created Gems

This article compares some of Chatham Created Gems’ synthetic coloured diamonds to natural diamonds and explains the results.

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Gemesis Laboratory-Created Diamonds

High-quality synthetic diamonds created by the Gemesis Corp. are examined and their gemmological properties are explicated.

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Identification of HPHT-Treated Yellow to Green Diamonds

Greenish 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.

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The Gemmological Properties of Russian Gem-Quality Synthetic Yellow Diamonds

Russian-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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De Beers near Colourless-to-Blue Experimental Gem-Quality Synthetic Diamonds

De Beers has produced a faceted synthetic gem-quality diamond that could go unrecognised without careful gemmological testing.

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The Gemmological Properties of the Sumitomo Gem-Quality Synthetic Yellow Diamonds

Sumitomo Electric Industries is producing gem-quality synthetic yellow diamonds in deep yellow single crystals in sizes up to 2 ct.

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Hydrogen-rich Diamonds
Grey-To-Blue-To-Violet Hydrogen-Rich Diamonds from the Argyle Mine, Australia

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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