Green zircon 0.69 ct.

Green zircon

among all the variety of zircons, the green ones are strongly metamict, though outside they looks like normal zircon,inside they lost their crystal structure and become isotropic glass.The metamictation process lower the refractive index,hardness and specific gravity,but not the dispersion. The green metamict zircon are quite rare and they have been formed with the presence of thorium and uranium that caused with their natural radioactivity they disrupt of crystalline structure..This gem is eye clean and comes from Sri Lanka.

Size: 5.2x5.2x3.4 mm.

Weight: 0.69 ct.

CODE#6938