Spheen Approx Weight: 0.22 CT. Size: 4x3 mm Shape: Oval Cut Color: Nice Green Lemon Clarity: Eye Clean To Slight Inclusion Luster: Dazzling Origin: Brazil Hardness: 5 - 5.5 Specific Gravity: 3.3 - 3.6 Refractive Index: N/A Chemical Composition: CaTiSiO5, Calcium Titanium Silicate Crystal Structure: Monoclinic Treatment: None