Amethyst is from the Greek word A which means "not" and Methustos which means "Intoxicated".
This obviously means that this crystal has the ability to prevent intoxication. As a trivial fact, the goblets of the Greeks and Romans were actually carved from it.
Amethyst is known for its many uses.
It is used to prevent insomnia and as a dream stone. Just place it under your pillow to have lovely dreams or you can rub it on your forehead to ease headache. It is also used as a defense for self denial. Amethyst is so powerful that it is used to unlock one's psychic and spiritual center. It is commonly worn as a necklace by healers because of its ability to focus energy.