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shell pearl necklace, bracelet, earrings
Shell Pearl as a Pearl Imitation

Examination of commercially-available "shell pearls" reveals imitation material.

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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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Confusing, Triangular Inclusions in an Art Deco-Style Pin
Spring 1991 G&G Lab Notes

This section, from the Spring 1991 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

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