Since Gemmology" was published readers have used it to gain an in-depth appreciation of the science of gemmology its history & practice. This third edition has been completely revised to cover the latest methods of gem enhancement & identification as well as the latest test instruments & laboratory techniques." Gemmology" serves as an invaluable reference guide for gemmologists professionals & students & is an invaluable text for anyone in the gemmological profession. Also included are details of the Gemmological Associations Foundation Course together with advice on examination techniques."