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Natural inclusions are visible when the assemblage is viewed face-up.

Beryl and Glass Assemblage Imitating Emerald

Tyler Smith and Augusto Castillo, August 9, 2018

An unusual assembled stone is examined at GIA’s New York lab.

A green dye concentration observed in beryl.

Dyed Green Beryl

HyeJin Jang-Green, January 27, 2017

A step-cut beryl is dyed to simulate emerald.

Article

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

Russell Shor, June 12, 2015

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

shell pearl necklace, bracelet, earrings

Shell Pearl as a Pearl Imitation

Jessie Yixin Zhou and Chunhui Zhou, July 25, 2014

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

This rough spinel, submitted as a diamond, displayed trigons orientated in the direction opposite to that of the crystal face.

Spinel submitted as diamond

Martha Altobelli, Paul Johnson, and Kyaw Soe Moe, January 31, 2014

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

Large Pinkish Brown CVD Synthetic Diamond

Troy Ardon and Sally Eaton-Magaña, October 17, 2013

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

Imitation Rainbow Moonstone Assemblage

Amy Cooper, Nathan Renfro, and Tara Allen, October 17, 2013

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

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