Home protection suncatchers - amethyst & black tourmaline benefits of black tourmaline: the big daddy of protection crystals. Used for centuries as a talisman to ward off physical and psychic attacks, radiation, and even environmental pollutants. An excellent grounding stone and highly recommended to aid with panic attacks and severe anxiety. Benefits of amethyst: this lovely purple stone is great for warding off negativity, sadness, and grief. For centuries it was used as a royal stone to protect against illness. It also helps with addiction, opening your third eye, and enhancing psychic abilities. Each crystal is 40mm (a little over an inch and a half wide).