DIAMONDS

• De Beers unveils Centenary diamond
• Large "chameleon" diamond
• Soviet production estimates updated
• Australian marine search for stones
• World-record auction price for a diamond
• Update on diamond mining in Brazil
• Jewelry-quality diamond crystals
• Bluish gray synthetic diamond thin films grown on faceted diamonds

COLORED STONES

• African gem update
• Amethyst from Afghanistan
• Unusual corundum/mica carving material
• Joint venture for Russian emeralds
• Large carved labradorite
• Fine greenish blue opal
• Another phenomenal organic gem material
• Cultured pearls auction
• Green zoisite

ENHANCEMENTS

• Faceted Aqua Aura update
• Plastic-treated jadeite
• Dyed quartzite imitation of dyed jadeite

SYNTHETICS AND SIMULANTS

• Chatham signs agreement with Japanese crystal grower...
• ...and issues warning on trademark infringements
• Novel fiber-optic glass
• "Encapsulated" Mexican opal
• Plastic imitation opal from Thailand
• Update on Soviet synthetics

INSTRUMENTATION

Appears on pages 116-125