Amethyst is said to calm the mind, relieve anxiety, and increase psychic intuition. It is believed to be a powerful protective stone. Some believe it to be a healing stone that can help us overcome addictions and other self-destructive tendencies. Amethyst is the birthstone for the month of February, and it is associated with the Zodiac signs of Aquarius, Pisces, and Sagittarius. It is a gift for the 4th, 6th, and 17th years of marriage. Amethyst is the official gemstone for the State of South Carolina.