Indigo Tourmaline 0.83 ct

Stone type:Tourmaline 
Weight: 0.83 ct
Color: Indigo blue
Dimension: 5.68 x 4.38 x 3.79 mm
Shape & Cut: Cushion, Yavorskyy cut 

Treatment: Unheated and Untreated (No Indications Observed)
Refractive Index: 1.618-1.643
Hardness: 7-7.5
Specific Gravity: 3.1
Optical properties: Doubly refractive
Chemical formula: Complex Boron Silicate
Shipment from: Thailand
Return Policy: 3 Day Money-Back Return*