Amethist 5x3 mm Ovaal ± 0.20 CT. Uruguay Nice Purple Clarity: Clean Luster: Fabulous Origin: Uruguay Hardness: 7 Specific Gravity: 2.65 - 2.91 Refractive Index: 1.544 - 1.553 Chemical Composition: SiO2, Silicon Dioxide Crystal Structure: Trigonal www.hetsteenenhuis.com
