Tourmaline is the name of a large group of boron silicate minerals. These minerals share a common crystal structure and similar physical properties - but vary tremendously 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. Tourmaline is a popular gemstone that is admired for its beauty and metaphysical healing properties. It can be found in many different shades of colors such as pink, green (or a combination of both), blue, brown, and black. Product Details: + Gemstone: Tourmaline + Color: Mixed Colors + Shape: Rondelle + Strand Length: 13 Inches + Size : 3-5MM + Treatment: Natural + Drill Orientation: Straight Drilled + Hole Size: 0.4mm + Approx. Beads: 140 Beads + Approx. Weight: 7 Grams For Wholesale pricing, contact us via email at email@example.com or call us at 347-656-4080.