Tourmaline is the name of a large group of boron silicate minerals. These minerals share similar properties - but vary in chemical composition. The wide range of compositions and color zoning within crystals. causes tourmaline to occur in more colors and color combinations than any other mineral group.
These earrings just make me feel "natural!" I bought the second pair because I loaned my first pair to a gal getting married in Hawaii and thought she should keep them and, she too, loved the gift!