Opaal (Multi Color) ± 0.20 CT. 6x4 mm Ovale Cabochon Color: Fine White with Rainbow Luster Clarity: Transparent Luster: Astonishing Origin: Australia Hardness: 5.5 - 6.5 Specific Gravity: 1.42 - 2.25 Refractive Index: 1.37 - 1.47 Chemical Composition: SiO2-nH2O, Hydrated Silicon Dioxide Crystal Structure: N/A
