With today's finest cultured pearls rivalling diamond, ruby, emerald and sapphire in terms of popularity, rarity and price, more and more people are searching for a reliable source of information to guide them in the fascinating and complex world of pearls -- natural, cultured and imitation. This revised and updated 4th edition is a comprehensive, authoritative guide that tells readers everything they need to know about pearls to fully understand and appreciate them, and avoid any unexpected -- and costly disappointments, now and in future generations. Special Feature: Exclusive interviews with the world's leading authorities on pearls, who offer "insider" insights and advice.