DIAMONDS

• Can Angolan diamonds be identified by country of origin?
• A visit to Venezuelan diamond mines.

• 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.
• Spessartine from Zambia.
• 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.

• 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.

Gem News Editors:
Mary L. Johnson, John I. Koivula, Shane F. McClure,
and Dino DeGhionno, GIA Gem Trade Laboratory, Carlsbad, California
 
Contributing Editors:
Emmanuel Fritsch, IMN, University of Nantes, France
Henry A. Hänni, SSEF, Basel, Switzerland
Karl Schmetzer, Peterhausen, Germany