Gemstone
Links
National Gemstone
http://www.preciousgemstones.com/GEMCOLLECTING.HTML
Introduction to collecting and investing in gemstones and colored diamonds, with descriptions of the types most widely traded.
NOVA
http://www.pbs.org/wgbh/nova/diamond/gemprimer.html
Gemstone primer with photos and vital information regarding gemstones.
Photomicrography by Erik Carlson
http://www.gemstoneinclusions.com
Photomicrography of diamonds and other gemstones.
Secret Jewelry Collection
http://www.geocities.jp/senribb/jewels/
A Japanese collector's site of jewelry, minerals and gemstones.
Secrets of the Gem Trade. The Connoisseur's Guide To Precious Gemstones.
http://secretsofthegemtrade.com/
A new gem book by by R. W. Wise.
Smithsonian Gem & Mineral Collection
http://www.min.uni-bremen.de/sgmcol/
Pictures and short descriptions of gems and minerals found at the Smithsonian.
The Image
Mineral and gemstone galleries. Physical properties and historical facts for minerals and gemstones.
University of Texas Gem Class
http://www.geo.utexas.edu/courses/347k/redesign/Gem_Notes/gemnote_triple_frame.htm
Gem and Mineral class at the University of Texas, Austin.