Since it was first published in 1962 'Gems' has become universally recognised as the most comprehensive and authoritative treatise on gem materials in the English language. This sixth edition, has been revised for relevance to today's practice and includes an expanded encyclopedic section. 'Gems' caters for the professional jeweller and student gemmologist, collector of gems and those with an insatiable interest in precious stones.Reviews of the previous editions: 'Any serious gemmologist should have a copy available for ready reference.' Gems and Gemmology '...a truly magnificent book.' New World '...this quintessential textbook and reference will serve yet another generation of students of gemmology.' The Australian Gemmologist