The Amber Ranch
- Dominican rough blue amber for jewellers and collectors.
- http://www.ambarazul.com

Florida Gold Coast & Mineral Society
- Gold and Mineral Society in Florida.
- http://www.fgcgms.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

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

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

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

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

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

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

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

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

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

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

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

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

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