Summer 1993 Gem News International
Botswana Produces Large Diamond
DeBeers Now Marketing High-Quality, High-Pressure Synthetic Diamond Products
DeBeers Offers CVD Industrial Synthetic Diamond Products
"Flanders Brilliant" Cut Debuts in U.S.
Sakha (Yakutia) Building up Diamond Reserves
Venezuela Diamond Production Up
Colored Stones
Blue Cancrinite from Greenland
"Emerald Matrix" from North Carolina
Gemstone Globe and Maps
Lapidary Art
Banded Iridescent Obsidian
Gems from Orissa, India
Cultured Freshwater Pearls from Hanoi, Vietnam
Peridot from Zabargad Island
Ornamental Porphyry from Canada
Natural Resin from Colombia
Ruby Mining near Mahenge, Tanzania
Enhancements
Opticon Follow-Up
Turquoise Treatment Stability
Synthetics and Simulants
Synthetic Corundum as a Topaz Simulant
Russian Flux-Grown Synthetic Emeralds
Novel Opal Simulants
More on Plastic Imitation Opal
''Synthetic Opal" from Russia
More on Paraiba Tourmaline Simulants
Color-Zoned Synthetic Blue Quartz
Nontransparent Synthetic Quartz
Synthetic Spinel from Eastern Germany
Announcements
New Exhibit at the Royal Ontario Museum
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