Winter 1984 G&G Lab Notes
Natural and Imitation Emeralds
Oolitic Opal
Dyed Cultured Pearls
First American Freshwater Cultured Pearls from Tennessee
Pseudo Star Quartz
Ruby Simulants
Spinel and Synthetic Ruby Doublet
Heat-treated Sapphire Colors
Color Change Spinel
Treated Tourmaline
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