These purple quartz crystals are most often seen in the form of cut gemstones, as amethyst is February’s birthstone. Its lavender to deep purple color is due to the presence of iron. As a healing stone it is known as the "gem of transformation," a powerful energizer which can be used to bring about physical, emotional, and spiritual change. Its history dates back to the ancient Greeks who used it not only to cure intoxication, but also to clear the head, sharpen the intellect, and render its users shrewd in business matters. Amethyst is found mainly in Brazil.