Terahertz and Black Tourmaline make a powerful combination. Terahertz is a man made stone that carries strong powers and healing benefits to the body.  Its thermal conductivity is very high, and can improve your energy flow and blood circulation.  This may help speed up your metabolism. Black Tourmaline absorbs negative energy and transmutes it into positive energy.  It is also a powerful grounding stone.
 
8mm beaded bracelet with two different sized Terahertz beads (8mm and 6mm) giving this a unique look.