Lab Notes Gems & Gemology, Summer 1990, Volume 26, No. 2

Summer 1990 G&G Lab Notes

Cultured Calcareous Concretions
Imitation Coral
Etch Channels in Diamond
Purple Diamond
Radioactive Glass Egg
Banded Lapis Lazuli
Gray Baroque Cultured Pearl
“Well-Worked" Pearl
Unusual Gem-Quality Sodalite
Spinel from Tanzania
Synthetics and Simulants in Period Jewelry
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