Name of mineral :corundum Mohs hardness :9 Refractive index :1.762~1.770 Specific gravity :4.00 Weight :5.46 ct Size (mm) : L 9.9×W 8.5×D 6.97 mogok, untreated Gem quality US $500,000 宝石辞典もくじ 戻る 次ページ