The new edition has been expanded since the last edition of 1994 edited by Peter Read. Gemologist Michael O’Donoghue as editor has written 17 of the chapters, whereas the other 14 chapters and identification tables are written by 12 different authors.

Part I consists of two introductory chapters. The Geological Sources of Gems by Roger Harding (37 pages) consists of the structure of the Earth, rocks and processes that formed them, ages of gems, gem regions, recovery methods, and finally a cautionary note on the term “origin”. The second chapter, entitled Crystalline Gem Materials by Ian Mercer (27 pages), introduces...

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