Amethyst is a violet variety of quartz often used in jewelry. A reference to the belief that the stone protected its owner from drunkenness. The ancient Greeks wore amethyst and made drinking vessels decorated with it in the belief that it would prevent intoxication. It is one of several forms of quartz. Amethyst is a semiprecious stone and is the traditional birthstone for February.
It is likewise the gemstone for the sixth and seventeenth anniversary. The gemstone is associated with the weekday of Wednesday.