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Authoritative information about minerals and materials that are used for gem and ornamental purposes. With chapters on crystal forms; physical, optical and chemical properties; formation and occurrence of gem minerals; cutting and polishing of gems; manufactured gems; metals used for gem mountings; descriptions of individual gems; and classification of gems according to various properties such as crystal form, hardness, specific gravity and colour. With black and white photographs, diagrams and tables.
First published 1925 by MacGraw-Hill Book Company, New York and London. This is the 4th edition, 6th impression of 1941. Condition: Very good for its age. No jacket.