Lab Notes Gems & Gemology, Spring 1989, Volume 25, No. 1

Spring 1989 G&G Lab Notes

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Transparent Green Augite
Covellite
Coated Diamonds Again Seen in the Trade
Unusual Inclusions in Diamond
American Freshwater Natural Pearls
Cultured Black Pearl Mystery
A Large Phosphophyllite Crystal
Verneuil Synthetic Ruby with Needle-Like Inclusions
A Large Fine-Color Star Sapphire
An Unusual Green Star Sapphire
Pink Spinel from the USSR
Synthetics and other "Modern" Substitutions in Period Jewelry and Reproductions
 
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