Mooie Groene Amethist 11x9 mm 3.09 CT. Ovaal uit Brazilië Color: Green Clarity: Eye Clean Origin: Brazil Hardness: 7 Specific Gravity: 2.65 - 2.91 Refractive Index: 1.544 - 1.553 Chemical Composition: SiO2, Silicon Dioxide Crystal Structure: Trigonal Treatment: None - Unheated