Lab Notes Gems & Gemology, Winter 1984, Volume 20, No. 4

Winter 1984 G&G Lab Notes

Unusual Diamond Inclusion
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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