Book excerpt: "A complete reference for goldsmiths, collectors, and jewellery makers, this book is a comprehensive guide to identifying, buying, using and caring for a dazzling array of jewels and gems." "Discover the origins of gemstones and understand the process of selecting the raw material. Includes practical advice on how to assess the quality, rarity, grade, durability, and cut of precious and semi-precious stones." "Learn how gems are calibrated, using the industry standard measurements of carats and points, and how they can be treated to improve both colour and clarity. A glossary section clearly explains all of the key terminology used." "Illustrations and colour photographs help you to identify the gemstones available to jewellery makers, from amethysts and diamonds to tourmaline and quartz, and demonstrate how they can be used in different designs and settings."--Jacket