Newly published in a fourth edition, this definitive guide takes the mystery out of appreciating, buying,and selling gemstones. It covers everything from the romance and history of more than 1,800 gemstones to their geographic locations; scientific, physical, and color properties; and the way they are formed, structured, and mined. The book also fully covers the optical features of gems--light and color, luminescence, refraction, and inclusions--...