Four Treasures Reference Database
Record No. 16895
Practical Gem Testing
Book
Lewis, D. (1977) Practical Gem Testing. London, N.A.G. Press, 149 pp.
ISBN/ISSN: 7198 0041 2 | RWHL*
gems, gemology, basic gemology, spectra, gem testing
Nicely done general gemology from the late 1970s with instructions on the use of basic instruments. It is well illustrated and features excellent spectra.