Crystals have the ability to hold and emit energy vibrations. Crystals affect our electro-magnetic energy fields or subtle bodies which surround and permeate the physical body. These include the etheric, emotional and mental bodies, which are collectively called the aura. During treatment, various crystals are placed on or around a fully clothed person to induce deep relaxation, release stress and pain, and promote energy balance. They are placed on sites of pain, on acupuncture points or meridians, or on subtle energy centres called chakras.