PDF Download Secrets of the Gem Trade: The conno

Second enlarged and expanded edition published in November, 2016. Divided into two parts, this comprehensive gemstone grading manual describes the criteria used to quality grade faceted gems, cabochons, pearls, opals, star stones and Catseyes. It applies the grading criteria to 35 of important gemstones. <br /><br />The 2nd edition is 127 pages longer, adds 11 new chapters, 5 new introductory essays and 161 additional photographs.