Diopside is a Calcium Magnesium silicate in the monoclinic sysytem.
This interesting stone can be found as a green clear crystal or as a black stone commonly known as " Black Star Sapphire " or "Star of India" - although unlike Sapphire the Star of Diopside only has 4 points.
Black Star is mentally a very grounding stone. It helps concentration but in particular has a focus on right action. Interesting then that the name derives from the Greek - two vision, i.e. seeing both sides !
Green diopsode is more concerned with a soft healing balance for the heart. It has a feminine protective caring feeling much like relaxing in a green Forest.
Chrome Diopside is a more vibrant green - energising and tremendous for creative visualisations and can inspire a powerful self healing energy.