Peridoot lot 5.3x6.0x4.3 - 5.0x6.3x4.1 mm 6.45 CT Ovaal Color: Lime green Shape: Oval facet Weight: 6.45 CT. Size: 5.3x6.0x4.3 - 5.0x6.3x4.1 mm Clarity: VVS - SI1 Luster: Lovely Hardness: 6.5 - 7 Origin: Burma Quantity: 8 Piece's Specific Gravity: 3.31 - 3.48 Refractive Index: 1.630 - 1.695 Chemical Composition: (Mg, Fe)2SiO4, Magnesium Iron Silicate Crystal Structure: Orthorhombic Treatment: None