Double Terminated Quartz Crystals have a highly vitreous luster on these colorless Quartz beads which are transparent & show black internal characteristics. These side drilled 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 of electricity in circuitry.