Fall 1993 Gem News International
Argyle Production Update
Central African Republic Has Strong Reliance on Diamonds
CSO Names First Chinese Sightholder
Indian Polished Exports Increase
Russian Production High But Declining
United States Sells Diamonds from Stockpile
Zaire Faces Severe Mining Problems
Synthetic Diamonds
Chatham Proposes Production, Distribution of Russian Synthetic Diamonds
GIA Says Standard Tests Can ID Russian Gem-Quality Synthetic Diamonds
Sumitomo Electric Synthesizes High-Purity Diamonds
Colored Stones
Significant Amethyst Find in Maine
Chalcedony Colored by Large Mineral Inclusions
Massive Green Grossular Garnet from South Africa
"Rainbow" Hematite from Brazil
"Denim" Lapis Lazuli from Afghanistan
Reddish Purple Mica from New Mexico
Nepal Update
Peridot from Vietnam
Brazilian Paragonite Mistaken for Ruby
Unusual Double Star Sapphire
Black Spinel from Mexico
Spinel from Vietnam
Enhancements
World Diamond Congress Addresses Treatments
Update on Ruby Enhancement
Synthetics and Simulants
Glass Imitating Vietnamese Ruby
Dyed Magnesite Misrepresented as "Howlite Lapis''
Unusual Synthetic Blue Quartz
Imitation Gems from Zaire
To view the full section, download the PDF above.
