Gem News International Gems & Gemology, Winter 1999, Volume 35, No. 4

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
            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
            More on “Internal” Carving: Now Done to Synthetic and Natural Quartz
            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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