Amethyst (Jamunia or Kataila) is the semi precious stone possibly the most popular form of quartz in the world. Amethyst is a violet variety of quartz often used in jewelry. Amethyst stone strengthens Saturn (Shani) and rashi ratna for Aquarius. Gemstone is said to protect its wearer against seduction, intoxication, powers to stimulate, and soothe, the mind and emotions. Amethyst recognized as the official birthstone for the month of February. Amethyst deposits are in Brazil, India, Madagascar, Mexico, Myanmar (Burma), Namibia, Russia, Sri Lanka, United States (Arizona), Uruguay and Zambia.