Shell Pearl as a Pearl Imitation
Examination of commercially-available “shell pearls” reveals imitation material.
Flux-Grown Synthetic Ruby with Hydrothermal Synthetic Seed Crystal
An unusual synthetic ruby, combining a hydrothermal ruby seed and flux ruby overgrowth, is examined at the Carlsbad lab.
天然钻石上 CVD 合成膜的长期坚固性 (英语)
A natural diamond with a CVD synthetic film is examined at GIA's Carlsbad lab.
Rare Faceted Wurtzite
A stone submitted for identification is revealed to be the first wurtzite examined by the GIA lab.
Tenebrescent Zircon
Color modification is observed in a reddish orange zircon at the Bangkok laboratory.
黄色化学蒸气沉淀法合成钻石 (英语)
A Fancy yellow type Ib CVD-grown synthetic diamond undergoes testing at the New York lab.
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