Diamond: An Early History of the King of Gems by Jack Ogden, 2018. Yale University Press, New Haven and London, www.yalebooks.com/www.yalebooks.co.uk, 388 pages, illus., ISBN 978-0-300-21566-3. $40 hardcover.

Ruby, Sapphire & Spinel: An Archaeological, Textual and Cultural Study By Derek J. Content, 2016. Brepols Publishers, Turnhout, Belgium, www.brepols.net, 452 pages, illus., ISBN 978-2503568089. €150.00 hardcover.

Hardy, J. (2017) Ruby. Thames & Hudson, New York, 368 pp. ISBN 9780500519417

The Gübelin Foundation (2014) The Eduard Josef Gübelin Story: The Art and Science of Gems. London. Gübelin Group, Lucerne, and Unicorn Press, 306 pp., illus., hardcover, ISBN 978-1-91006-540-2

Samuels, S.K. (2014) Imperial Jade of Burma and Mutton-Fat Jade of India: Mining, Trade, and Use from Antiquity to the Present. SKS Enterprises, Inc., Tucson, AZ, USA, 248 pp. ISBN: 978-0-9725323-4-1

Saul, J.M. (2014) A Geologist Speculates: On Gemstones, Origins of Gas and Oil, Moonlike Impact Scars on the Earth, the Emergence of Animals and Cancer. Paris, Les 3 Colonnes, x + 149 pp. ISBN: 978-2-37081-004-5