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Fancy black NPD synthetic diamond
Fancy Black NPD Synthetic Diamond

Testing reveals the first synthetic nano-polycrystalline diamond (NPD) to be detected by a gem lab.

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HOC synthetic alexandrite inclusion.
Challenges in Orienting Alexandrite: The Usambara and Other Optical Effects in Synthetic HOC-Grown Russian Alexandrite

Overview and commentary on the 2013 Journal of Gemmology article “Synthetic alexandrites grown by the HOC method in Russia: Internal features related to the growth technique and colorimetric investigation.”

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CVD Synthetic Round Brilliant
Round CVD Synthetic Diamond Over 1 Ct Identified in Hong Kong Lab

Advances in CVD growth technology have resulted in crystals that yield well-proportioned round brilliant cuts.

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Abstract Header from the 2009 issue of Gems & Gemology
Abstracts; Summer 2009

This article, from the Summer 2009 issue of Gems & Gemology, is a compilation of abstracts of important gemology-related articles published outside of Gems & Gemology.

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Article
Fancy Black NPD Synthetic Diamond

Testing reveals the first synthetic nano-polycrystalline diamond (NPD) to be detected by a gem lab.

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Large Synthetic Moissanite with Silicon Carbide Polytypes

Examination of the properties of a synthetic moissanite specimen submitted as a black diamond.

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Article
Sapphire Series Part 4: Gem Synthetic Sapphire and Diffusion-Treated Synthetics

From the series, "Sapphire: A Crystal With Many Facets," this article explores how an increase in synthetic sapphire technical applications has affected the synthetic gem industry.

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Article
Sapphire Series Part 2: The Next Generation of Sapphire Crystal Growth Techniques

The second in the series, "Sapphire: A Crystal With Many Facets," this article looks at several advanced growth techniques.

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Article
CVD-Grown Synthetic Diamonds, Part 3: Detection

This article provides a brief overview of methods for detecting CVD-grown synthetic diamonds.

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Large Pinkish Brown CVD Synthetic Diamond

Report on the analysis of an unusually large CVD synthetic diamond, unique in that its Faint to Light pinkish brown color doesn’t appear to be the result of post-growth treatment.

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