Mooie Heldere Afrikaanse Amethist 14x7 mm Marquise ± 2.25 CT. Color: Best Purple Clarity: Clean Luster: Blinding Origin: Africa Hardness: 7 Specific Gravity: 2.65 - 2.91 Refractive Index: 1.544 - 1.553 Chemical Composition: SiO2, Silicon Dioxide Crystal Structure: Trigonal