Buying colour gems is a challenge. To make a wise choice you must be able to judge their colour flaws transparency & brilliancy. This guide will show you how. Written for both consumers & professionals it is easy to read has over 200 colour photographs & gives practical pointers on how to buy the best stone for the money. Whether you are interested in jade opal ruby topaz spinel garnet tourmaline or some other coloured gem you will find this guide to be a fascinating & valuable resource. Topics covered include: price comparison; gem treatments; quality evaluation; gem cleaning & care; fake stones; savvy buying.