PHILIP'S GEMS OF THE WORLD

The first section - "The World of Gems" - contains information on gem formation, mining, crystal structure, and both the optical and physical properties of gemstones. The second section - 'Gems of the World' - provides an in-depth description of each gem. Organized by chemical composition and grouped in a logical classification scheme, each gem has its own full-page or double-page entry. As well as the raw crystal, other photos and artworks show the preferred cuts and beautiful examples of jewellery made from the gem.The explanatory text provides information about the conditions under which the gem is formed, where it is mined and its physical properties.