Smithsonian Handbooks: Gemstones
Gemstones of the World, Revised Edition
Gemstones of the World: Newly Revised Fifth Edition
The Jeweler's Directory of Gemstones: A Complete Guide to Appraising and Using Precious Stones From Cut and Color to Shape and Settings
Color Encyclopedia of Gemstones
The Art of Gem Cutting: Including Cabochons, Faceting, Spheres, Tumbling, and Special Techniques (Gembooks)
The Crystal Bible
Gemstone Buying Guide, Second Edition: How to Evaluate, Identify, Select & Care for Colored Gems
Smithsonian Handbooks: Rocks & Minerals (Smithsonian Handbooks)