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Spring 1991, Volume 27, Issue 1 (sold out)

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Gem News


TUCSON '91

DIAMONDS

  • Colored diamonds
  • Gem-quality synthetic diamonds from the USSR

COLORED STONES

  • Madagascar apatite
  • Interesting bead materials
  • Cat's-eye beryllonite
  • Large clinohumite
  • Update on corundum
  • Unusual colored stone cuts from Thailand
  • Drusy gems in jewelry
  • Uralian emeralds
  • Morganite from Mozambique
  • Brazilian opal
  • Cultured pearls
  • Arizona peridot
  • Bicolored quartz
  • Cat's-eye rose quartz
  • Rhodolite from Orissa
  • Violet cat's-eye scapolite
  • Update on tanzania
  • Paraiba tourmaline
  • More on Vietnam gem finds

ENHANCEMENTS

  • Plastic-treated ammonite
  • Enhanced Paua shell
  • Colored Opticon for emeralds
  • Heat treatment of ruby in Sri Lanka
  • More on diffusion-treated sapphires

SYNTHETICS AND SIMULANTS

Appears on pages 46-55

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