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."
Florida Gold Coast & Mineral Society: Gold and Mineral Society in Florida.
FTC: FTC Guides for jewelry and precious metals.
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: An on-line gem and jewelry course at UC Berkeley.
Gemstone Forecaster Newsletters: Analyzes Burma ruby and sapphire gems and collector gemstone markets.
GeoNord: Gem and mineral site from Sweden.
National Gemstone: Introduction to collecting and investing in gemstones and colored diamonds, with descriptions of the types most widely traded.
NOVA: Gemstone primer with photos and vital information regarding gemstones.
Secret Jewelry Collection: A Japanese collector's site of jewelry, minerals and gemstones.
Secrets of the Gem Trade. The Connoisseur's Guide To Precious Gemstones.: A new gem book by by R. W. Wise.
Smithsonian Gem & Mineral Collection: Pictures and short descriptions of gems and minerals found at the Smithsonian.
The Amber Ranch: Dominican rough blue amber for jewellers and collectors.
The Image: Mineral and gemstone galleries. Physical properties and historical facts for minerals and gemstones.
University of Texas Gem Class: Gem and Mineral class at the University of Texas, Austin.