International Colored Gemstone Association (ICA)
The International Colored Gemstone Association (ICA), a non-profit organization, is the only worldwide body specifically created to benefit the global colored gemstone industry. ICA was founded in 1984 and is now comprised of 500+ gem industry leaders from mine to market, including miners, gem cutters, suppliers, retailers, trade associations, gemological laboratories, academia, museums, and more, from 47 countries who are devoted to advancing and promoting the knowledge and appreciation of colored gemstones.
Gemdat- Extensive Database of Gems, Locations and Photos
gemdat.org - The Gemstone and Gemology Information Website.
Gemdat is a unique reference web site on gems and gemology with something for everyone from beginners to experts. Join the community and get involved!
Current statistics: 624 gem names. 526 gemstone data pages. 3,153 total locality items listed from 1,474 sites worldwide. 8,171 photos.
The Mineral and Gemstone Kingdom
The Mineral and Gemstone Kingdom is a free informational and educational guide to rocks, minerals, gemstones, and jewelry. This site has been providing detailed information and photos of hundreds of mineral and gemstone since 1997 and is one of the leading education resources on minerals and gemstones.