Lab Notes Gems & Gemology, Volume 47, No. 4

Winter 2011 G&G Lab Notes

A Rare Fancy Vivid Purple Diamond
A Strongly Purple-Colored Black Diamond
HPHT-Treated Diamond with Fluorescence Pattern of an HPHT-Grown Synthetic
Type IIb Diamond with Long Phosphorescence
Clarity-Enhanced Opal with Artificial Matrix
Ethiopian Black Opal
Coated Bead-Cultured Freshwater Pearls
Tenebrescent Zircon
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Type IIb Diamond with Long Phosphorescence - Videos (see below)
January 18, 2012

Type IIb Diamond

Type IIb Diamond
Phosphorescence & Thermoluminescence