Diamonds 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 To view the full section, download the PDF above.
Diamonds 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 To view the full section, download the PDF above.
