Hair Brushes from Australia. Luxury Hair Tools Around the World. Tourmaline is a semi-precious mineral stone and is one of the few minerals that have the ability to emit negative ions and far infrared rays. Tourmaline has the amazing ability to become its own source of electrical charge, as it is both pyroelectric and piezoelectric. When the gemstone is subjected to increased pressure or when it is drastically heated or cooled, it creates an electrical charge that can emit infrared waves and negative ions.