Amethyst is a deeply settling stone, and is very versatile in what it offers us.
Chief amongst it's offerings is protection from what does not serve us. This includes addictive habits and substances, as well as negative energies or people who would harm us. When working with amethyst, any negative energy directed your way is transmuted into love.
Speaking of love, because of it's ability to transmute all energies into love, Amethyst supports us in living a life full of love, and helps us to give others (and ourselves!) the benefit of the doubt.