Completely revised and expanded, the 2nd edition of Secrets of the Gem Trade, the Connoisseur's Guide includes eleven new chapters: Jade / Demantoid Garnet / Natural Nacreous Pearls / Conch Pearls / Sunstone / Moonstone / Peridot / Cobalt Blue Spinel / Red-Pink Spinel / Golconda (Type IIa) Diamonds. Five new introductory essays: Blue-white diamonds / Jadeite / Natural Pearls / Spinel / Feldspars. Plus two hundred seventy-eight color photographs, one hundred seventy-one additional, which include exclusive images from major museum collections and the latest auction market icons. The definitive book for anyone wanting to learn how the best gemologists in the world evaluate precious gems, and what makes one stone merely a good stone versus a truly fabulous museum-quality gem. Author, "Richard W. Wise is one of the world's foremost gemologists." Gemkey Magazine