Monday, August 17, 2009
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Blue Sapphire
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Blue Sapphire:
CHEMISTRY Al2O3
CRYSTALLOGRAPHY Hexagonal
REFRACTIVE INDEX 1.757 - 1.779
HARDNESS 9 SPECIFIC GRAVITY 3.99 - 4.0
CLEAVAGE None
HEAT SENSITIVE No
WEARABILITY* Excellent
SPECIAL CARE INSTRUCTIONS None
ENHANCEMENTS Heat treated. Common. Diffusion treatment, (places a thin blue coating on colorless sapphire.) Occasional. Irridation, (turns colorless gems yellow, orange or light blue.) Rare.
