How Can You Tell if Your Green Amethyst Is Real or an Imitation? Green Amethyst is a variety of amethyst, which is very rare, and it is found naturally within the earth’s crust. It is also known as Prasiolite and recently gained fame in the world of gemstone jewelry. This alluring gemstone is a unique structure of quartz, and its mesmerizing green color is due to the presence of iron impurities within its crystalline structure. The charming green color of green amethyst represents the beauty of springtime and the renewal of nature.