Green amethyst, also known as prasiolite, is a variety of quartz that is known for its green color. Unlike other forms of amethyst which are typically purple, green amethyst is a rare and highly sought-after gemstone due to its unique color. A natural green amethyst bracelet is a type of jewelry that features green amethyst gemstones set in a metal band or cuff. The gemstones are often cut into round or oval shapes, and they can range in size from small to large depending on the desired look of the bracelet.