Summer 1992 G&G Lab Notes
Large Chameleon-Type Diamond
Treated "Black" Diamond
Emerald Imitation: Yag
Glass Imitations of Various Gems
Black Pearls from Baja California
Treated Black Mabes
"Geneva [Synthetic] Ruby"
Durability of Heat-Treated Sapphire
Identifying Curved Striae in Yellow Synthetic Sapphire
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