Amethyst is a purple variation of quartz that owes its beautiful coloration to irradiation, iron impurities, and the presence of trace elements. Amethyst is a 7 on the Mohs scale. This specific piece weighs 49.90 cts. and measures 33x18x13 mm exhibiting that beautiful rich purple color that Amethyst is usually known for. These pictures are not to scale so please read each description for the actual size. This piece may have been heated.