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Natural gemstones

http://pubs.usgs.gov/gip/gemstones/

Online booklet on natural gemstones, terminology, geologic environment, birthstones, U.S. production, chemical formulas, and references.

U.S. Geological Survey General Information Product
Related topics:
Gem resources, Mineralogy, Reports
Alternative formats of this information:
Compatible standard Format
FGDC-CSDGM Text XML JSON
CCM of Project Open Data JSON
ISO 19115 XML
USGS Publications Warehouse [Citation page] - [MODS XML]

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