Amethyst carries a high frequency that protects the energy field, clears the aura and chakras, and purifies the individual, removing any negative energy and allowing them to move forward in life, into higher states of consciousness.
The ancients wore amethyst to prevent them from overindulging in alcohol. Amethyst has strong protective properties and guards against psychic attack. Drinking excessive alcohol opens one up to attacks from negative entities, and wearing amethyst shields against such attacks and helps one stay sober. I think we can all use some amethyst in our stockings. Amethyst can also assist in overcoming addictions to cigarettes, drugs, and other habits.