Kremkow, C. "Emerald" http://www.bway.net/ica/emerald.
html Updated 2/26/96
(April 29, 2000)
"Emerald"http://www.gemhut.com Updated: May 17, 1999 (April 29, 2000)
International Colored Gemstone Associationhttp://www.seemall.com/gems/ EMERALD.HTML (April 22, 2000)
Hochleitner, Rupert. Minerals New York: Barons, 1994
http://www.gemstone.org/emerald. html updated: January 1999 (April 29, 2000)
Friedmen, Hershel. "Emerald"http://www.minerals.net (April 22, 2000)
Genesis Gems. "Colombian Emeralds" http://www.genesisny.net/Emerald.html (May 21, 2000)
Ameraf Mining and Development http://home.intekom.com/Emeraldmine/sp_emer.htm updated: 15 October 1998 (May 22, 2000)
Kohler, Danielle "Golden Beryl 'Heliodor'" http://www.jewelry-by-danielle.com/page7.html updated: 29 March 2000 (May 22, 2000)