Los Angeles, California: Gemological Institute of America, 1966. [7th ed.]. Octavo in brown boards, gilt titles; 426 pp: frontispiece, illustrations, photographs (b&w); 22 cm Near fine to Near Fine(-); slight cock to textblock; mild rubbing to edges of spine; pages clean and crisp. Hardcover.
"Outlined in great detail, this book discusses instrumentsused for testing and the tests and procedures in identifying gemstones, which are grouped according to color. Also includes useful tables of properties, glossary, and various flow charts." --Publisher
