Lab Notes Gems & Gemology, Spring 2007, Volume 43, No. 1

Spring 2007 G&G Lab Notes

Blue Diamonds Showing Multiple Colors of Phosphorescence
Diamond with “Etched Dislocation Loops”
HPHT-Annealed Yellow-Orange Diamond with a Strong 480 nm Absorption Band
Translucent Greenish Yellow Diamonds
Unusual Natural-Color Black Diamond
Synthetic Diamond, Possibly Grown at Higher Temperatures
Heat-Treated Blue Sapphire with Unusual Dendrites
Yttrium Aluminum Garnet (YAG) with a Dislocation Spiral
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