4.5 cts 12x10x7 MM African Amethyst loose faceted 886D Click here To see more faceted Amethyst
100% real not man made but genuine from the earth gemstone.
100% Genuine and natural no treatment.
100% money back if not happy.
Mohs hardness 7
Refractive index 1.544-1.553
Critical angle 40°
Specific gravity 2.63-2.65
Fracture Conchoidal, brittle.
Dispersion Medium (.013)
Heat sensitivity Low
Pleochroism Amethyst very weak (purple to grayish purple); Natural citrine weak (yellow to light-yellow); Prasiolite very weak (light-green to paler green); Rock crystal colorless, no dichroism; Rose quartz weak (pink to paler pink); Natural dark smoky definite (brown to reddish-brown).
Birefringence (double refraction) Weak (.009)
Crystal structure Hexagonal
Cutting Quartz cuts easily. Pre-polishing with 1200 Nubond or 3000 standard lap will make polishing much quicker and more enjoyable.
Polishing Cerium oxide on most common polishing laps.