by Cally Hall · Omega · tapa dura · ISBN 9788428209960
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«Piedras preciosas» is the visual identification guide by Cally Hall, published by Ediciones Omega in 1995 in hardback (160 pages, in Spanish).
Visual guide bringing together more than 130 varieties of precious stones, with identifying photographs. The content is organised by mineralogical characteristics in three blocks: precious metals, cut stones and organic materials, to facilitate recognition and consultation.
It belongs to the Manuales de Identificación collection from Ediciones Omega. It is the first edition; the photographs are by Harry Taylor and the editorial advisor is Roger Harding.
Intended for those starting out in the study of precious stones and looking for a practical quick-reference guide.
