Is a delicate material with a pleasant color,but quite soft and require care in handle. A calcium carbonate CaC03 with traces of copper that is responsible for it's blue color, hardness 3-3.5.
It comes from Wenshan Mine,Yunnan, China and is totally natural, untreated.
Size: 18.8x13.5x7.5 mm.
Weight: 9.40 ct.