This book contains a wealth of information on the physical and optical properties of gemstones. It covers in great detail each facet of these properties in the hope it will assist you, the reader, in correctly identifying gemstones. This publication has been written for both the experienced gem fossicker and the beginner. The information included will assist the beginner to get a good foundation knowledge on the physical and optical properties of gemstones, and if you are an experienced gem fossicker or gem collector, this book will make a wonderful refresher course on the subject.