Chrome Diopside is found in depsoits around the world but due to small crystals is rarely found in large sizes.
The deep green colour is caused by rich chromium depsoit when the crystal formed causing this deep green. Although there is a very rare varity found in italy called violan. The largest depsoits yet found are in sibera and smaller sources in europe and the US and Canada. It has a mohls hardness scale of 5-6 and a refractive index of 1.66-1.72.