Gemstones: The Flowers of the Mineral Kingdom
Lists of some of the gem kingdom's more prized and recognized members by their chemical makeup.
mineral.galleries.com/minerals/gemstone/class.htm
Natural Gemstones
Terminology, chemical formulas, collectors' information, and more from the USGS.
pubs.usgs.gov/gip/gemstones
Gem of a Story, A
Explore the Hall of Geology, Gems, and Minerals at the National Museum of Natural History, and browse through an extensive gem and mineral image database.
www.bsu.edu/eft/gems
Mineral and Gemstone Kingdom
Information and images of minerals, including a special gemstone section.
www.minerals.net
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