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Winter 1999, Volume 35, Issue 4

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Gem Trade Lab Notes


  • BERYL with Unusual Eye
  • DIAMOND
    - Exhibiting Much Fire
    - Identifying Treated-Color Rough with the Spectroscope 
    - Yellow to Yellow-Green Diamonds Treated by HPHT, from GE and others
  • PEARLS
    - Freshwater Natural
    - Notable Strand of Large Black Cultured Pearls
  • SAPPHIRE
    - With a Valuable Inclusion
    - With High Refractive Indices

Lab Notes Editors:
Thomas Moses, Ilene Reinitz, Shane F. McClure - GIA Gem Trade Laboratory

Contributing Editors:
G. Robert Crowningshield - GIA Gem Trade Laboratory, East Coast
Karin Hurwit - GIA Gem Trade Laboratory, West Coast
Mary L. Johnson - GIA Gem Trade Laboratory, West Coast
Cheryl Y. Wentzell - GIA Gem Trade Laboratory, West Coast

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