Double Terminated Quartz Crystals have a highly vitreous luster on these colorless Crystal Quartz beads which are transparent to semi-transparent show black internal characteristics. Thesestraightdrilled Double Terminated Quartz gems resemble Herkimer Diamond Quartz in shape. These Quartz beads are Piezoelectric which means that they transforms Energy into Light – Heat or Electric Voltage which was the very reason Scientists in the 1950`s used Quartz as a transmitter in electric circuitry.