gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1988.052.367.29 Book Reviews Color Encyclopedia of Gemstones O'Donoghu M. 9 1988 52 367 562 562 Arem J. E. Color Encyclopedia of Gemstones 1987 Van Nostrand Reinhold New York (2nd edition) vii+248 pp. Price £39·95 Copyright © 1988, The Mineralogical Society 1988