Tourmaline gemstones are a mixture of many types of crystals and minerals. This diversity in combined materials gives tourmalines their dazzling choice of colors, including bi-colored, multicolored and dichroic. With the vast choice of colors available, tourmalines are referred to as the “gemstones of the rainbow.” In addition to the variety of colors, another unique attribute of this beautiful gemstone is that no two tourmalines are exactly the same color. Tourmaline gemstones are highly available and come in an almost endless array of colors making this large family of gems one of the most popular and versatile gemstones and ideal for all types of jewelry. Tourmaline is the birthstone for October and is also the recommended gift for the 8th wedding anniversary.