Not only are they a extremely high quality these crystal's have been cleansed of negative energy and empowered with positive Sheng Ch'i energy, which is said to bring wealth, health and good luck. Amethyst is the stone that possesses the strongest spiritual energy. It is a remarkable stone as a meditation and concentration support. Amethyst stimulates the intellectual side of your life. Increases activity of right-side brain - purifies blood - reinforces immunity system - increases psychic skills and intuition - tranquilliser. This master healer is a good crystal to energise and clear negative energy. All crystals vary in size.