Zucker, Benjamin, HOW TO INVEST IN GEMS, Dorset(UK): Blandford Press, 1977, pp128(text), pp16(color plates)

This used book is out-of-print and hard to find. It has an attractive dust jacket. It is a layman's guide to the connoisseur's world of rubies, sapphires, emeralds, diamonds, and other precious gemstones.