Winter 1991 Gem News International
Botswana Expands into Diamond Manufacturing
Large Chinese Diamond
Diamond Center Planned for China
Data Suggest Strong, Changing U.S. Diamond Market
Diamond Factory to Open in Dubai
G.E. Synthesizes Large Carbon-13 Diamonds
Guinea's Aredor Produces another Large Diamond
Indonesian Production on Line
"Nickel Thermometer" for Diamond Exploration
New "Royal" Diamond Cuts
Colored Stones
Hairy Insect in Amber
Czechoslovakian Conference Yields Valuable Information
Novel Chrysoberyl "Cross" Cat's-Eye
Attractive Tanzanian Diopside
Fine Emerald/Green Beryl from Nigeria
New Production of Demantoid Garnets from Russia
Tanzanian Yellow Grossular Garnets
Large Tsavorite Garnet from Tanzania
"Recycled" Ivory
More on Peruvian Opal
Antique Portrait Ring
More Synthetics Sold as Natural Ruby in Vietnam
Update from Sri Lanka
Sunstone/Iolite Mixture
Update on Tanzanite Mining
Bicolored Tourmaline with Unusual Color Effect
Synthetics and Simulants
New Laser Crystals with Gem Potential
Novel Synthetic Star Sapphire
Enhancements
More on Opticon as a Fracture Filler
Filled Cavernous Emerald Crystal
Filled Synthetic Emerald in Parcel from Swat
Deceptive Color Coating of Sapphires in Sri Lanka
More on Paraiba Tourmaline Simulants
Instrumentation and New Techniques
Distinguishing Diffusion Treatment from Surface Coating
New Setting Method Challenges Diamond Testers
Jewelry Imaging/Teleconferencing System Introduced
Tweezer Improvement
Announcements
Southeast Asia Gemmological Conference
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