This is a rare and unusual, round cabochon-cut, strong-grey Indian Moonstone gem. It weighs 13.75cts and measures 16mm across.
Below are the main details:
Size:
16 mm
Shape:
Round Cabochon-Cut
Colour:
Strong-Grey
Clarity:
Opaque
Lustre:
Good
Origin:
India
Hardness:
6 - 6.5
Specific Gravity:
2.64 - 2.68
Refractive Index:
1.533 - 1.552
Chemical Composition:
NaCa(Al, Si)AlSi2O8, Sodium Calcium Aluminum Silicate
Crystal Structure:
Monoclinic
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