This Black Tourmaline bead necklace measures 21” long with a knot in between each bead, is about 2/8” thick, weighs 30 grams and has roughly 30 beads. Ready to wear or take apart and inspire something of your own creation...the possibilities are endless! Black Tourmaline...a sacred stone family with a trigonal crystalline structure...Schorl, the black variety, contains boron silicate and sodium iron, uniting to form an energy of integration, balance and embodiment. With its clear and precise striations, Tourmaline stimulates and aligns the energetic body while removing blockages. A protective stone, black tourmaline is said to absorb negative energy, including EMF's (Electro-Magnetic Frequencies from electronics.) Explore the energies of this stone in your own crystal practice!