Lab Notes Gems & Gemology, Fall 1990, Volume 26, No. 3

Fall 1990 G&G Lab Notes

Dyed Natural Beryl
Carved Chrysoberyl
Electron Irradiated Diamond
Fancy Black Diamond
Included Diamond Crystal
Opal with an Unusual Inclusion
Cultured Pearls with Colored Bead Nuclei
Freshwater Natural Pearls
Gray Baroque Cultured Pearls
Diffusion-Treated Montana Rough Sapphire
Large Colorless Sapphire
Cobalt Colored Color-Change Spinel
Synthetics and Simulants in Period Jewelry
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