Amazon.com Product Description This 6mm round of natural green Tashmarine has a classic Portuguese cut and a weight of 1 carat. If you're searching for something new and different, Tashmarine is a beautiful choice. Discovered in 2001, in the mountainous Xinjiang province of China, this beautiful gem variety was brought to market shortly thereafter and is considered the first gem discovery of the 21st century. A uniquely light and bright variety of the mineral diopside, Tashmarine is a transparent stone that ranges in color from blue-green to slightly yellow-green. Its distinctive color is completely natural, not heat-treated or irradiated. To clean your Tashmarine gemstone, use warm soapy water and a soft brush or an ultrasonic cleaner.