- 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 R. W. Wise.
- 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.
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