Unique Star Sapphire with Transparent Core
Three Irradiated CVD Synthetic Diamonds
Irradiated CVD-grown diamonds are examined in the Carlsbad lab.
Cabochons Fashioned from the Shell of Crassostrea Virginica
Crassostrea virginica, the so-called Eastern or American oyster, is a commercial seafood widely distributed along the east coast of the United States to the Gulf of Mexico.
大批高温高压合成米粒钻中发现的一颗天然米粒钻 (英语)
Over the last decade, the production methods used to create synthetic diamond melee have improved substantially, along with the quality of the specimens themselves.
Beryl and Glass Assemblage Imitating Emerald
An unusual assembled stone is examined at GIA’s New York lab.
15 Carat HPHT Synthetic Diamond
Two Natural “Horse Conch” Pearls
Rare pearls, along with their shell, are studied in the Hong Kong lab.
Large HPHT-Treated Blue Type IIb Diamond
A look at the color zoning exhibited by the largest HPHT-treated blue diamond graded by GIA.
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