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Amethyst is a purple variety of quartz (SiO2) and owes its violet color to irradiation, iron impurities (in some cases in conjunction with transition element impurities), and the presence of trace elements, which result in complex crystal lattice substitutions.
Amethyst Natural Birthstone. Amethyst is one of the natural birthstones of those born as the old year wanes and the new is about to arrive at the winter solstice (November 21 - December 20). Amethyst crystals bring you creativity, perception, self knowledge, and insight. Amethyst - Zodiac Stone of Pisces