Amethyst is an extremely powerful and protective stone. It contains a high spiritual vibration. It guards against psychic attack, transmuting that energy into love. It’s serenity enhances higher states of consciousness and meditation. Amethyst has strong healing and cleansing powers and will enhance your spiritual awareness. It is extremely beneficial to the mind, calming or stimulating as appropriate. Amethyst is one of the most spiritual stones, promoting love of the divine, giving insights into its true nature, and encouraging selflessness and spiritual wisdom.
(The Crystal Bible)