Guide price: £20-40

NATURAL TANZANITE Colour Blue, Weight 7.90ct. Shape & cut Trillion, 12.29mm x 12.03mm x 7.01mm, Optic Ch Biaxial, Refractive Index 1.69-1.70, Specific Gravity 3.5, MOHs Scale 6.5-7.00, Species Zoisite, Treatments Heating