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Industry Resource and Association Links

Educational Resources

American Gem Society
The was established in 1934 by a select group of independent jewelers and Robert M. Shipley, founder of the prestigious school of gemology, the Gemological Institute of America (GIA).

American Gem Trade Association
Founded in 1981, the AGTA is leading industry force in the ethical promotion of natural colored gemstones and cultured pearls.


Chrono-Shop is a parts site that has a lot of Rolex marks and code information posted on their site.


Diamond Council of America
The Diamond Council of America (DCA) was founded in 1944 as a forum to educate jewelry sales professionals about diamonds and gems.

Gemological Institute of America 

Established in 1931, GIA is the world’s foremost authority on diamonds, colored stones, and pearls. A public benefit, nonprofit institute, GIA is the leading source of knowledge, standards, and education in gems and jewelry.

The Ganoksin Project
The Ganoksin project provides a variety of quality services for the gem and jewelry community. We work hard to maintain the high standards of our services for the benefit of our visitors. Our services are provided free of charge and to the benefit to all.


The Gemology Project
The Gemology Project is a non-profit gemstone and gem science wiki-style database for anyone interested in gemstones and gemology (gemmology). Every month we highlight a gemstone and a piece of gemstone identification equipment to help us all understand more about the wonderful world of colored stones and diamonds.


International Gemological Institute (IGI)
The International Gemological Institute (IGI) is the largest independent laboratory for grading and valuating diamonds and fine jewelry, and is renowned for its quality services, extensive experience and expertise.


International School of Gemology
The ISG was originally an Allied Teaching Center for the Gemological Association of Great Britain before going independent in 2004. The ISG holds memberships in the American Gem Trade Association, Cultured Pearl Association of America, Diamond Council of America, Texas Jewelers Association, the Manufacturing Jewelers and Suppliers of America, and other professional industry associations such as Polygon. The ISG is a certified education provider for many US State Departments of Insurance to train insurance agents and adjusters in gemology, and is active in the insurance industry for assisting with high dollar jewelry insurance claims in the US and Europe. The ISG Registered Gemologist Appraiser Program has been recognized and accepted by insurance and jewelry industry organizations world-wide.


Estate Jewelry and Silver Research

Antique Jewelry University
This site has excellent reference information on styles and makers of jewelry.

Heritage Auctions
Heritage Auction’s database of jewelry markers marks.
925-1000 is considered the “go to” site for the identification of sterling silver items, and markers marks and hallmarks.


History & Styles of English Silver from the Middle Ages to Art Deco.

Indian Native American Hallmarks
Indian Native American Jewelry Artists  & South West Shop Hallmarks A to F

Silver Collection
The Silver Collection is another silver reference site that is particularly useful in identifying Italian gold and silver numerical maker’s marks.


Sterling Flatware Fashion
A comprehensive guide to American sterling silver flatware, a tremendous resource of flatware information, retailer marks, current silversmiths, silver repair and replating services.

British & Irish Silver Maker’s Marks
The aim of this web site is to provide an aid in the identification of British and Irish silversmiths from their makers’ or sponsors’ marks. All graphics are taken from real hallmarks.

Industry Associations


Jewelers Board of Trade
For 125 years, The Jewelers Board of Trade has been providing its members with the vital information they need to make good credit decisions.


Jewelers of America
Jewelers of America is the national trade association for businesses serving the fine jewelry retail marketplace.


Jewelers for Children 

Jewelers for Children, formerly known as the Jewelers Charity Fund for Children, is a 501 (c) 3 non-profit organization that raises money in the fine jewelry and watch industries that is used to help children who are the victims of catastrophic illness or life-threatening abuse and neglect.


Jeweler Vigilance Committee
The JVC works to ensure compliance with the law by the jewelry industry and to support ethics & integrity.


Jewelers Security Alliance
The JSA leads the way in fighting jewelry crime.


MJSA is the trade association dedicated to professional excellence in jewelry making and design.


National Association of Jewelry Appraisers (NAJA)
The Association’s primary purpose is to recognize, and make available, the services of highly qualified, informed, experienced, independent, and professional appraisers of gems and jewelry to those members of the public requiring such expertise.


Providing online marketing and sourcing power to jewelry industry professionals for over 20 years.


The Society of North American Goldsmiths supports and advances the professional practice of artists, designers, jewelers and metalsmiths since 1969.


Women’s Jewelry Association
WJA, founded in 1983, is the preeminent association of professional women in the jewelry, watch and related businesses.


World Gold Council
Founded in 1987, the World Gold Council is an organization formed and funded by the world’s leading gold mining companies with the aim of stimulating and maximizing the demand for, and holding of Gold.

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