Gram Faceting
http://www.faceters.com/ An excellent site for rough, gemstones, faceting equipment, and faceting instructions. Based in Tucson, Arizona. There is an incredible amount of information on Jeff's site.

Majestic Gems
http://www.majesticgems.com/ Offers a fine selection of natural gemstones from around the world and based in Scottsdale, Arizona. Check out Brett's collector's gemstones and drool.

National Gemstone
http://www.preciousgemstones.com/ I'm a big fan of Robert Genis's site and newsletter. He has excellent information on collecting and grading gemstones. He also has beautiful gemstones for sale. Based in Tucson, Arizona.

OBG International Gems & Mineral
http://www.infodyn.com/obg/ Offers mineral specimens from around the world including my favorite Arizona mineral Wulfenite. Owner Thomas Corson has been collecting minerals for 45 years and exhibits at the Arizona and Colorado gem shows. Based in Green Valley, Arizona USA.

World's Smallest Museum
http://www.worldssmallestmuseum.com/ I really like roadside attractions. Check out this link to some folks in Superior Arizona. Their museum is free and you can learn about and buy Apache Tears.