Fine Art Solutions
The best gemology forum - Gemology Online
The Gemology Wiki - gemologyproject.com
John Koivula's MicroWorld of Gems
GIA's Gems & Gemology
A forum dedicated to photomacrography and photomicrography - photomacrography.net
Charles Krebs's krebsmicro.com
The mineral database www.mindat.org
www.wildmicro.com
www.macrorail.com
www.savazzi.net
www.gemsociety.org
Accredited Gemologist Association