The wire that the crystal hangs from is known as Memory Wire and is usually used to make bracelets. The black beads are all hematite, the colored ones are known as Chinarovksi crystal (i think they are basically lead crystal, but I'm not 100% sure on that).
Reiki is a Japanese word loosely meaning Universal Life Force. This energy surrounds and guides us all, all the time. This energy is provided to us by the Elements, the Higher Powers and our Ancestors. When one is initiated into the ranks of Practitioners, one can help guide, and be guided by, the healing energies all around us. Practitioners may also infuse objects with Healing Reiki Energy for a time-release effect.
This crystal will release Reiki Energy all the time, so the more you have it near you the more energy you will receive from it! One does not have to believe in Reiki for it to work, but you will notice a difference in your life when you work with it!
I have Reiki level 3 training. This crystal will be cleansed and activated using the Usui Reiki Symbols.
Crystals are naturally very high in Healing Energy on their own, and the Reiki Symbols will only enhance the Natural Healing, Calming and Centering Effects.