Amethyst, usually a purple colored quartz stone, is a powerful healing stone which wards off nightmares and insomnia. Amethyst also helps promote peace and calm while amplifying protection against negative energies. Amethyst is often associated with the third eye chakra. The Saint Benedict Medal is worn to ask for God's blessing and protection upon us, our homes and possessions, especially through the intercession of St. Benedict in addition to being a prayer of exorcism against Satan.