Lab NotesGems & 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 To view the full section, download the PDF above.

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