Diopside is a calcium magnesium silicate and includes several different gemstone varieties, each with a hardness of 5-6 on the Mohs scale. Diopside is best known for the vivid green chrome diopside, but the black diopside exhibiting asterism or the star effect is also important. Chrome diopside is colored by chromium and displays a forest green color similar to tsavorite garnet and chrome tourmaline. Tashmarine diopside is a brilliant yellow-green diopside from Tajikistan, Uzbekistan and Western China. This is a non-chromium-bearing diopside with a lighter and brighter color than the deep forest-green color typical of chrome diopside.
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