Lab NotesGems & Gemology, Summer 1992, Volume 28, No. 2

Summer 1992 G&G; Lab Notes

Heat-Damaged Filled Diamond 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 To view the full section, download the PDF above.

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