Natural Pink Tourmaline Faceted Tear Drops Briolette Beads Strand Length is 8 Inches & Sizes 4mm to 10mm approx. Contact us to buy less length. Tourmaline (tur-mah-Leen) is a crystal boron silicate mineral compounded with elements such as aluminium, iron, magnesium, sodium, lithium, or potassium. Tourmaline is classified as a semi-precious stone and the gemstone comes in a wide variety of colors.