This is the most comprehensive guide to the chemical and subtle nature of gemstones and their use throughout history. Johari includes detailed instructions for the creation of gem talismans and the rituals surrounding the use of gems to obtain desired effects. He also uses Hindu astrology to explain the gems you should wear to maximize your physical and psychological well-being. New edition of a popular classic. This is the first book in this subject area to draw on the ancient Hindu sciences of Tantra, Ayurvedic medicine, and astrology, as well as on the author's own family tradition of gemology.