Spinel looks like a black, 'in vogue,' diamond, 2.43ct
Myanmar ), where some of the most beautiful colors are mined, spinel was recognized as a separate gem species as early as 1587.
Spinels were most often referred to as 'balas rubies', which may have referred to their color or their country of origin.
Gem reports Identification results:
Chemistry; MgAl2O4
Crystallography; Isometric.
Refractive Index; 1.712 - 1.717, normal. Reds may go up to 1.735 and blues to 1.747.
Hardness; 7.5 - 8.
Specific Gravity; 3.58 - 3.61.
Cleavage; None.
Heat Sensitive; No.
Wear ability; Excellent.
Special Care Instructions; None.
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