Name of mineral : Tourmaline Mohs hardness : 7~7 Refractive index : 1.624~1.644 Specific Gravity : 3.06 Heated Gem Quality Size(mm): L 8.6 x W 6.8 x D 3.67 Weight: 1.57 ct US $25,000 宝石辞典もくじ 戻る 次ページ