Name of mineral : Corundum Mohs hardness : 9 Refractive index : 1.762~1.770 Specific Gravity : 4.00 Heated Gem Quality Size(mm): L 7.3 x W 5.6 x D 3.41 Weight: 1.59 ct US $15,000 宝石辞典もくじ 戻る 次ページ