And amethyst is a type of quartz. It is often used in jewelry. The amethyst is the birthstone for the month of February. The color of the amethyst is a violent or purple. In crystal form, it is a six sided prism. The top of the prism and in a six sided. Typically. A fake amethyst could be made from several materials. It could be the last or plastic as well as other materials. At one time, it was thought to protect its owner from drunkenness.