Exotic Gems, Volume 3: How to Identify, Evaluate, Select and Care For Matrix Opal, Fire Agate , Blue Chalcedony, Rubellite, Indicolite, Paraiba and Other Tourmalines Third in a series of books that explains with color photos the price factors and identifying traits of unusual gems. The stones are shown not only loose but also in jewelry, in the rough and as beads. Fun facts, historical anecdotes, geographic sources, gem treatment information, cutting advice, and tips on gem care are included along with diagrams and tables to aid in identification and evaluation.