Indigo Tourmaline 0.55 ct

Stone type: Indigo Tourmaline 
Weight: 0.55 ct
Color: Indigo Blue
Dimension: 5.84 x 4.93 x 2.96 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*