Crystal therapy works on the theory that the illness is to be found within the electromagnetic fields, also known as the aura, which forms an egg-shaped energy field around us. The energy within the aura should flow freely, if the energy is blocked possibly due to negative thoughts, pollution or stress. If these blockages are not cleared disease may be the result. Crystals have been used for thousands of years for their protecting and decorating and healing properties. The ancient Egyptians used crystals; they powdered Malachite and applied it to wounds to prevent infection. They were among the first to say that Amethyst had healing properties and often used it to treat hangovers. Crystals can be used in a variety of ways. Crystals can be held, or placed on or around the body by the practitioner and with absent healing with the persons consent. They can be worn as necklaces, earrings or rings, a can also be placed around the house or workplace.