Name of mineral :corundum Mohs hardness : 9 Refractive index : 1.762~1.770 Specific gravity : 4.00 Weight :12.73 ct Size (mm) : L 12.5×W 10.3×D 8.68 sri lanka, Possibly heated Gem quality US $120,000 宝石辞典もくじ 戻る 次ページ