Summer 1998 G&G Lab Notes
Diffusion Treated Corundum
Diamond Colored by Pink Coating
Diamond with Different Color Appearances Depending on Viewing Position
Manufactured Glass Represented as “Green Obsidian”
Cultured Pearls with Dolomite Beads
Cultured Pearls with Treated Black Color
Quartzite Dyed to Imitate Sugilite
An Unusual Sapphirine
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