This is a pair of beautiful, round-facet, electric purple/blue, natural Tanzanite gemstones. They weigh 0.20cts (0.40cts total weight) and measure 3.5mm across each.
Below is the technical information:
Size:
A Pair of 3.5 mm
Shape:
Round-Facet
Colour:
Purple/Blue
Clarity:
Eye-Clean
Lustre:
Stunning
Origin:
Tanzania, Africa
Hardness:
6 - 7
Specific Gravity:
3.2 - 3.4
Refractive Index:
1.69 - 1.70
Chemical Composition:
Ca2Al3(SiO4)3(OH), Calcium Aluminum Silicate Hydroxide
Crystal Structure:
Orthorhombic
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