A common form of quartz. Amethyst is usually purple, but can range in color from pale lavender to a very deep, reddish purple and may have milky white or green inclusions. Deeper-colored amethysts are more highly valued. The name comes from the Greek for "not drunken" as wearing amethyst was believed to be a proof against becoming intoxicated. The amethyst is said to bring good luck and to radiate love. Amethyst is the birthstone for February. Some variants are Cape amethyst and Ametrine.