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Spring 2003, Volume 39, Issue 1

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Gem Trade Lab Notes


DIAMOND

  • With Fracture Filling to Alter Color
  • Intensely Colored Type IIa, with Substantial Nitrogen–Related Defects
  • With Unusual Overgrowth

EUCLASE Specimen, with Apatite and Feldspar

“Cherry Quartz” GLASS Imitation

Cat’s-eye OPAL

“Blue” QUARTZ

RUBY, Heat Treated with a Large Glass-Filled Cavity

Play-of-Color ZIRCON

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