£18
NATURAL TANZANITE Colour Blue, Weight 9.15ct. Shape & cut Trillion, 13.06mm x 12.86mm x 7.48mm x 9.65mm Optic Ch Biaxial, Refractive Index 1.69-1.70, Specific Gravity 3.5, MOHs Scale 6.5-7.00, Species Zoisite, Treatments Heating
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