Stone Width: 15 mm Stone Length: 12mm Chain: 18 Inches Closure: Spring Ring Amethyst is a protective and magical stone. It blocks geopathic stress and negative environmental energies. Amethyst also has strong healing, cleansing powers and enhances spiritual awareness. This stone is extremely beneficial to the mind, calming or stimulating as appropriate. Amethyst is one of the most spiritual stones on the planet.