Sources of gemstone properties and locations:

• Hall, Cally. Smithsonian Handbook: Gemstones. 2nd American ed. Dorling Kindersley, Inc., 2002
   
• Oldershaw, Cally. Gems of the World. 1st ed. Firefly Books, Ltd., 2009
   
• Schumann, Walter. Gemstones of the World, 4th ed., Sterling Publishing, 2009
   
• Latitude/Longitudes for gemstone locations obtained from Mindat.org Mineralogy Database website at URL: http://www.mindat.org/.
   
• JewelInfo4u for additional gemstone mine locations, including maps at URL: http://www.jewelinfo4u.com/Mines.aspx.

Gemstone, background and sidebar image sources: 

• Wikipedia Commons. Sources for project imagery are listed in the attached spreadsheet in MS Excel-format. (requires MS Excel or compatible reader). Includes locations, attributions, and available URL to specific images.
   
• Absolute Background Textures Archive, http://www.grsites.com/textures
   
• BellsnWhistles, http://www.bellsnwhistles.com/page9.html
   
• Microsoft Office Sidebar image sources: MS Office textures, edited in MS Office, MS PowerPoint and MS Paint

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