This is a rare, stunning purple/blue, round cabochon-cut, natural Tanzanite gemstone. It weighs 1.25cts, measures 6mm and has eye-visible inclusions throughout.
Comes complete with a full appraisal and retail valuation certificate (includes full colour image of the stone).
Appraisal Value = £196.85
Tanzanite is already one thousand times rarer than diamonds and given that it is only 6.5 on the Mohs scale, many pieces are accidentally destroyed. The fact that it is formed by a unique geological phenomenon, that has less than a million to one chance of being repeated, means that according to geological tests, the world’s supply of Tanzanite will be totally exhausted within 10 to 15 years. (Quote from The Tanzanite Authority Website)
Below are the technical details:
Size: | 6 mm | |
Shape: | Round Cabochon-Cut | |
Colour: | Purple-Blue | |
Clarity: | Translucent | |
Lustre: | Outstanding | |
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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