Gem Quality Natural Tourmaline Bracelet - 7.5mm beadsProduct Name: Gem Quality Natural Tourmaline Bracelet Product Details: Size: 7. 5mm; gem quality Description: Tourmaline is a unique gemstone, known for its natural ability to exhibit both positive and negative electrical poles, which is why it is often referred to as an electric stone. Formed from high temperature gases within magma that condense into a mineral, tourmaline contains a variety of trace elements and emits negative ions, often called