Spring 1991 Gem News International
Show Exhibits of Note
Diamonds
Colored Diamonds
Gem-Quality Synthetic Diamonds from the USSR
Colored Stones
Madagascar Apatite
Interesting Bead Materials
Cat's-Eye Beryllonite
Large Clinohumite
Update on Corundum
Unusual Colored Stone Cuts from Thailand
Drusy Gems in Jewelry
Uralian Emeralds
Morganite from Mozambique
Brazilian Opal
Cultured Pearls
Arizona Peridot
Bicolored Quartz
Cat's-Eye Rose Quartz
Rhodolite from Orissa
Violet Cat's-Eye Scapolite
Update on Tanzanite
Paraiba Tourmaline
More on Vietnam Gem Finds
Enhancements
Plastic-Treated Ammonite
Enhanced Paua Shell
Colored Opticon for Emeralds
Heat Treatment of Ruby in Sri Lanka
More on Diffusion-Treated Sapphires
Synthetics and Simulants
New Synthetic Alexandrite
Update on Chatham Production
More on Synthetic Emeralds
Man-Made Hematite Simulant
Imitation Lapis Lazuli
Gold in Quartz Doublets
More Soviet Synthetics
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