Plastic Imitations of Emerald
Emily Jones and Abadie Ludlam, August 4, 2023
Two items submitted as emerald to the New York lab are identified as plastic manufactured products.
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Glass Imitation of Cat’s-Eye Chrysoberyl
Tsz Ying Fong, August 4, 2023
A brownish yellow cabochon submitted as cat’s-eye chrysoberyl is identified as artificial glass.
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Shell Pearl as a Pearl Imitation
Jessie Yixin Zhou and Chunhui Zhou, July 25, 2014
Examination of commercially-available "shell pearls" reveals imitation material.
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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.
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Honey Brown and Light Yellow Hydrogrossular: An Uncommon Jade Imitation
Supparat Promwongnan, Budsabakorn Srisataporn, and Jirapit Jakkawanvibul, November 10, 2021
The Gem and Jewelry Institute of Thailand (GIT) identifies two samples as hydrogrossular using advanced testing techniques.
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Dyed Yellow Beaded Freshwater Cultured Pearls Imitating South Sea Cultured Pearls
Lore Kiefert and Pierre Hardy, August 7, 2017
A yellow cultured pearl necklace is compared to the work of a producer specializing in freshwater pearls of all colors.
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Synthetic Rock Crystal Quartz Cluster with Natural-Looking Inclusions
Larry Tai-An Lai, January 25, 2023
A synthetic quartz crystal cluster is easily mistaken as a natural specimen.
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Red-Dyed Spodumene Imitating Ruby
Guy Borenstein and Sean O’Neal, January 25, 2023
Testing identifies a “red corundum” sample as red-dyed spodumene.
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Identification of Natural, Reconstructed, and Imitation Root Amber
Yan Li, Yilei Feng, Zhaoyi Li, and Yamei Wang, January 25, 2023
Three types of root amber beads submitted for identification are analyzed in Wuhan, China.
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Black Non-Nacreous Pearl Imitations Made of Beads Cut from Shell
Stefanos Karampelas, Ali Al-Atawi, Hasan Abdulla, Bader Al-Shaybani, and Fatema Almahmood, November 15, 2019
The DANAT laboratory recently encountered two natural black color beads cut from an unknown mollusk.
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