Fluorescent Minerals under Ultraviolet Light  
   Descriptions and pictures of different gems and minerals under UV lights.
   http://home.pacifier.com/~leopard/

Bluechart  
   A gem identification chart for $18.
   http://www.gembluechart.com/

Caribbean Gemological Institute  
   Caribbean jewelers organization includes jewelry, shopping and travel tips..
   http://www.carigem.org/

Dan Dennis  
   Author of "Gems: A Lively Guide for the Casual Collector."
   http://www.dandennis.com/

FTC  
   FTC Guides for jewelry and precious metals.
   http://www.ftc.gov/bcp/guides/jewel-gd.htm

Gemstone Forecaster Newsletters  
   Analyzes Burma ruby and sapphire gems and collector gemstone markets.
   http://www.preciousgemstones.com/Forecasters.html

NOVA  
   Gemstone primer with photos and vital information regarding gemstones.
   http://www.pbs.org/wgbh/nova/diamond/gemprimer.html

University of Texas Gem Class  
   Gem and Mineral class at the University of Texas, Austin.
   http://www.geo.utexas.edu/courses/347k/redesign/Gem_Notes/gemnote_triple_frame.htm

The Image  
   Mineral and gemstone galleries. Physical properties and historical facts for minerals and gemstones.
   http://www.theimage.com/

Gem Hut  
   Hundreds of descriptions for gems, minerals, and rare metals. Pictures, hardness, and composition.
   http://www.gemhut.com/

Secrets of the Gem Trade. The Connoisseur's Guide To Precious Gemstones.  
   A new gem book by by R. W. Wise.
   http://secretsofthegemtrade.com/

Gems and Precious Stones  
   An on-line gem and jewelry course at UC Berkeley.
   http://ist-socrates.berkeley.edu/~eps2/

GeoNord  
   Gem and mineral site from Sweden.
   http://www.geonord.org/

Photomicrography by Erik Carlson  
   Photomicrography of diamonds and other gemstones.
   http://www.gemstoneinclusions.com

Secret Jewelry Collection  
   A Japanese collector's site of jewelry, minerals and gemstones.
   http://www.geocities.jp/senribb/jewels/

Gemology Tools  
   Software for the professional gemologist or gemology student/enthusiast.
   http://www.gemologytools.com

National Gemstone  
   Introduction to collecting and investing in gemstones and colored diamonds, with descriptions of the types most widely traded.
   http://www.preciousgemstones.com/GEMCOLLECTING.HTML

Florida Gold Coast & Mineral Society  
   Gold and Mineral Society in Florida.
   http://www.FGCGMS.com

Smithsonian Gem & Mineral Collection  
   Pictures and short descriptions of gems and minerals found at the Smithsonian.
   http://gimizu.mzuther.de/sgmcol/