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Plastic opal imitation by Kyocera alongside the company's polymer-impregnated synthetic opal.
New Plastic Imitation Opal from Kyocera

A plastic product that mimics the play-of-color phenomenon of natural opal but has distinctly different gemological properties is now available to consumers.

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A green dye concentration observed in beryl.
Dyed Green Beryl

A step-cut beryl is dyed to simulate emerald.

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Spring 2015 G&G Examines Blue Spinel, Chinese Jewelry Design and the Latest in Synthetics

G&G Brief presents an overview of the content of the Spring 2015 issue of Gems & Gemology.

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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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Spinel Submitted as Diamond

It is a rare occurrence when a diamond simulant submitted to a GIA laboratory turns out to be a natural gemstone.

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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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Imitation Rainbow Moonstone Assemblage

Examination of an imitation rainbow moonstone assemblage containing plastic-coated gypsum.

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