Meaning
Amethyst is said to promote sustained mental alertness and a deeper sense of spirituality. This may strengthen judgment and support honesty and sincerity. In many cultures, amethyst has been used to combat nightmares, possibly due to its ability to promote lucid dreaming and clarify inner imagery. An amethyst under the pillow or a geode in the bedroom is said to promote a more conscious experience of dreams.
Alleged effect
Amethyst is said to have a clarifying and detoxifying effect, which can promote concentration and conscious processing of thoughts. For this reason, it is often used as a "touchstone" or to assist in dealing with grief and sadness. It is also said to help one more easily let go of addictive behaviors and uncontrolled actions.