Summer 1991 Gem News International
DeBeers Unveils Centenary Diamond
Large "Chameleon" Diamond
Soviet Production Estimates Updated
Australian Marine Search for Stones
World-Record Auction Price for a Diamond
Update on Diamond Mining in Brazil
Jewelry-Quality Diamond Crystals
Bluish Gray Synthetic Diamond thin Films Grown on Faceted Diamonds
Colored Stones
African Gem Update
Amethyst from Afghanistan
Unusual Corundum/Mica Carving Material
Joint Venture for Russian Emeralds
Large Carved Labradorite
Fine Greenish Blue Opal
Another Phenomenal Organic Gem Material
Cultured Pearls Auction
Green Zoisite
Enhancements
Faceted Aqua Aura Update
Plastic-Treated Jadeite
Dyed Quartzite Imitation of Dyed Jadeite
Synthetics and Simulants
Chatham Signs Agreement with Japanese Crystal Grower
Chatham Issues Warning on Trademark Infringements
Novel Fiber-Optic Glass
New Glass Imitation of Lapis Lazuli
"Encapsulated" Mexican Opal
Plastic Imitation Opal from Thailand
Update on Soviet Synthetics
Instrumentation
Loupe with True Darkfield Illumination
New Cutting Machines Developed
Announcements
Canadian Gemmological Assn. to hold Conference in October
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