Amethyst is a form of quartz, with a silicon dioxide composition .The primary ingredient is sand. The majority of quartz samples are clear, but amethyst derives it's beautiful purple appearance due to small amounts of iron impurities in the crystal lattice.
Amethyst was considered to preserve sobriety in ancient Greece and Amethyst adorned wine goblets to prevent drunkenness. Leonardo Da Vinci wrote that Amethyst dissipated evil thoughts and quickened intelligence. Amethyst is a noticeable adornment in the British Crown Jewels, and the color purple has come to be symbolic of royalty. Amethyst was believed to promote piety and celibacy, and it was a popular ornamentation for religious purposes in the Middle Ages.
Amethyst occurs in Africa, Australia, Russia, South America, Brazil, Uruguay.