This is an unusual, oval cabochon-cut, natural Indian rainbow Moonstone gem. It weighs 4.75ct and measures 12x10mm.
Below are the technical details:
Size:
12x10 mm
Shape:
Oval Cabochon-Cut
Colour:
Rainbow-Effect
Clarity:
Translucent
Lustre:
Bright
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