Name of mineral : Corundum Mohs hardness : 9 Refractive index : 1.762~1.770 Specific Gravity : 4.00 Untreated Gem Quality Size(mm): L 13.5 x W 10.9 x D 7.41 Weight: 9.64 ct US $120,000 宝石辞典もくじ 戻る 次ページ