Is a Lead Carbonate with formula PbCo3 and hardness of 3-3.5.
It has a very high refractive index and the strong dispersion makes it a fantastic gem, especially when is seen under incandescent light or in the sun.
This gem comes from the Kombat Mine Tsumeb , Namibia well known for having produce the best specimen in the world of this mineral; today is quite difficult and good specimens are highly prized.
The stone is cut by Luigi Mariani and his eye clean.
Size: 7.6x7.6x6.4 mm.
Weight: 6.07 ct.