Amethyst is a violet variety of quartz often used in jewelry. It is one of several forms of quartz. Amethyst is a semiprecious stone and is the traditional birthstone for February. The best varieties of amethyst can be found in Siberia, Sri Lanka, Brazil and the far East. Explore Art By God’s collection of Amethyst at affordable prices in a variety of colors and sizes. Gorgeous amethyst for sale. Amethyst Geodes, Amethyst clusters, individual crystals and unique formations.