Our Affiliations

Accredited Gemologist Association

As a professional peer society, the AGA believes in excellence and is dedicated to establishing the highest ethical and professional standards of practice. Members gain peer recognition for active participation in educational programs and industry forums gaining the personal satisfaction of improving skills while contributing to the profession.



The AGTA is an association of United States and Canadian trade professionals dedicated to promoting the long term stability and integrity of the natural colored gemstone and cultured pearl industries. The Association pursues its goals through the combined use of educational programs, publicity, industry events, government and industry relations, and printed materials for both the trade and consumer. The AGTA is well-known in the gemstone and jewelry industries for maintaining the highest ethical standards.


The American Society of Jewelry Historians, members



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. In addition, NAJA seeks to promote the trademark and professional designations earned by our members and to make available continuing educational materials in order to ensure that they are among the best informed appraisers in our industry.

Finally, it is our goal to promote professionalism among our members as well as the industry as a whole. All of the above should provide reasonable assurance to the public of the professional skill, integrity, and responsibility of our members.



The ICA is a non-profit organization and the only worldwide body specifically created to benefit the global colored gemstone industry. ICA’s global network works to develop a common language for promotion and consistent business standards necessary to improve international communication and trade of colored gemstones.


GIA Alumni Association

Our mission is to reach, serve, and engage GIA alumni; to encourage lifelong relationships, provide opportunities for continuing education and foster networking throughout the gem and jewelry industry.


Association for the Study of Jewelry and Related Arts


Diamond Development Initiative


Gemmological Association of Great Britain


American Society of Appraisers


Women’s Jewelry Association

© 2001-2023 Lang Antiques, All Rights Reserved. | Site Map