Guide price: £20-40

NATURAL TANZANITE Colour Blue, Weight 9.30ct. Shape & cut Cushion, 12.68mm x 9.65mmx 7.17mm, Optic Ch Biaxial, Refractive Index 1.69-1.70, Specific Gravity 3.5, MOHs Scale 6.5-7.00, Species Zoisite, Treatments Heating