The Firefly Guide to Gems: The introduction describes the geology, chemistry and properties of gems in clear and accessible terms, and also provedes a valuable color key.

The main section supplies complete descriptions of a wide range of gems, with illustrations of the cerystal, the gem, common cuts and jeweley.

* describes more than 130 varieties of gemstones
* Over 850 photos of gems, crystals, and jewelry.
* More than 50 drawings and diagrams