Fall 1991 Gem News International
Argyle Set to Expand with Mining at Home
Argyle Also Plans to Expand Cutting in China
Operations Re-Established at Elizabeth Bay
Warnings of Large-Scale Theft
New Soviet Diamond Source
Additional Diamonds Recovered at Fort a La Corne, Saskatchewan, Canada
Conference on Synthetic Diamond and Diamond-Like Coatings
New Diamond Cuts
Historical Diamond Photographs
Colored Stones
Colombia Reports Record Emerald Exports
Large South Sea Pearl
Myanmar to Authorize Thai Buyers
Postage Stamp Commemorates Large Burmese Ruby
Small-Scale Sapphire Mining Continues in Thailand
Tanzanian Spinel
Update from Tanzania
Tanzania Invites Tenders for Mineral Rights
Large Paraiba Tourmalines
Tourmaline with Unusual "Color Change."
Tourmaline/Andalusite: A Pleochroism Caveat
Purple and "Chrome" Green Vesuvianites from Quebec
Unusual Red Zoisite
Enhancements
Faceted Gems Coated with Diamond-Like Carbon
Montana Sapphire Heat Treatment
More Experimentation with Blue Diffusion-Treated Sapphires
Red Stones Also Experimented With
Synthetics and Simulants
Porous Gilson Synthetic Opal
Instrumentation and New Techniques
Distinguishing Diffusion Treatment from Surface Coating
New Setting Method Challenges Diamond Testers
Jewelry Imaging/Teleconferencing System Introduced
Tweezer Improvement
Announcements
Tucson Gem and Mineral Show 1992
American Craft Assn. Supports Legislation
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