Amethyst is purple quartz and is one of the most popular gemstones. It varies from pale lavender to deep purple with red highlights. Amethyst is generally abundant and quite inexpensive. Amethyst is purple, lilac or mauve. The highest quality is transparent. The ancient greeks believed that Amethyst protected its owner from drunkenness. They wore amethyst and made drinking vessels of it in the belief that it would prevent intoxication.