Winter 1999 Gem News International
Can Angolan Diamonds be Identified by Country of Origin?
A Visit to Venezuelan Diamond Mines
Colored Stones and Organic Materials
Matte-Finished Montana Agates
Dickite: Consider the Odds
Star Ekanite
“American Golden Opal” from Nevada
The Formation of White Zones in Mexican Opals During Fashioning
An Update on the John Saul Ruby Mine
Ruby from Songea, Tanzania
Another Source for Bicolored Sapphire: Tunduru, Tanzania
Spessartine from Nigeria
Tremolite Rock from China Represented as “Longxi Jade.”
Tsavorite from Madagascar
Treatments
The Chemistry of Emerald Fillers
Hematite Coating on Heat-Treated Garnet
Factors in the Heat Treatment of Corundum
Synthetics and Simulants
Manufactured Products Imitating Charoite
Miscellaneous
More on “Internal” Carving: Now Done to Synthetic and Natural Quartz
Announcements
Basel 2000
International Rough Diamond Conference
ISA Personal Property Appraisal Courses
Kremlin Gold at the Houston Museum of Natural Science
Treasures from Topkapi Palace
West Coast Antique & Period Jewelry Seminar 2000
Gemstones at Upcoming Scientific Meetings
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