Gemstone
Links
Bluechart
A gem identification chart for $18.
Caribbean Gemological Institute
Caribbean jewelers organization includes jewelry, shopping and travel tips..
Dan Dennis
Author of "Gems: A Lively Guide for the Casual Collector."
Gem Hut
Hundreds of descriptions for gems, minerals, and rare metals. Pictures, hardness, and composition.
Gemology Tools
Software for the professional gemologist or gemology student/enthusiast.
Gems and Precious Stones
http://ist-socrates.berkeley.edu/~eps2/
An on-line gem and jewelry course at UC Berkeley.
Gemstone Forecaster Newsletters
http://www.preciousgemstones.com/Forecasters.html
Analyzes Burma ruby and sapphire gems and collector gemstone markets.
Larimar Museum
The Larimar Museum in Santo Domingo-scientific facts about the blue volcanic pectolite Larimar.