Amethyst

This beautiful purple stone is a stone of meditation and spirituality. It cleanses, purifies, restructures, and renews. When you wear this stone it will reduce anger, impatience, and nightmares. It can also help overcome addictions. The ancient Greeks believed people who wore an amethyst or drank from an amethyst chalice would not become intoxicated.
-Courtesy of "Healing Jewelry" Mickey Baskett

You should try it some time. Let me know how it goes.