Prachtige Imperial Topaas 9.15 CT. 10.1x14x6.8 mm Octagon gefacetteerd Color: Imperial Clarity: SI1 Luster: Excellent Hardness: 8 Specific Gravity: 3.4 - 3.5+ Refractive Index: 1.61 - 1.64 Chemical Composition: Al2SiO4(F,OH)3, Aluminum Silicate Fluoride Hydroxide Crystal Structure: Orthorhombic Treatment: None