Herkimer diamond quartz is a naturally double-terminated clear quartz crystal that has a very high vibration. The double-termination is like a mini generator, amplifying its energy and the stones surround it that you may work with. Some have black carbon within it adding to the energy of working with the shadows within you, aiding in bringing up blcokages to the surface and clearing away stuck issues and sahdows. Please select clear or w carbon.