Gem Reference Guide,GEM IDENTIFICATION MADE EASY : A Hands-On Guide to More Confident Buying,Gem Reference Guide: Gemological Institute of America (GIA): 9780873110198: Amazon.com: Books,宝石鑑別書 (Gem Identification Report),Gem Identification Made Easy (6th Edition): A Hands-On Guide to More Confident Buying & Selling: Matlins PG FGA, Antoinette, Bonanno FGA ASA MGA, Antonio C.: 9780997014556: Amazon.com: Books