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2023 AGA
Diamond Sponsor

Estate Buyers

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Continuing Education

We encourage you to enhance your experience and knowledge by taking classes, attending trade shows, and participating in workshops throughout the year. 

AGA strives to offer two educational conferences per year. One in Tucson during the Gem and Mineral Show at the beginning of each year and one in Las Vegas during JCK mid-year.

Meet the leaders. Enrich your knowledge of gemology and gem trade issues by exchanging information with a diverse range of professionals. We've met with gemstone treaters, crystal growers, enhancement detection specialists, designer gem cutters, the trade press, gem instrument developers, computer technology specialists, domestic and international traders and the FTC.

Certified Gem Lab

AGA Voting Members can achieve certification by fulfilling the highest equipment standards and compliance with the AGA code of ethics. (Gem Lab Certification information.)

AGA Designation Materials for Voting Members

Identify and promote your image as a dedicated, ethical and professional gemologist using the following items.

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AGA is NOT a laboratory…

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Glass-Filled Ruby Information

AGA Tucson Conference Jan 31, 2024

Mark your calendar!
Wednesday, January 31, 2024 AGA Tucson Conference and Gala

AGA is excited to announce the date for the 2024 AGA Tucson Gemological Conference and Gala & Awards Ceremony. All gemological enthusiasts and guests are invited to attend both or either event in person, or register to receive video recordings of our conference sessions. Conference speakers & event registration details - coming soon!

Serving the Gemological Community for 50 Years!
AGA is celebrating this milestone throughout 2024, kicking it off in Tucson! Watch for further announcements as AGA commemorates its golden anniversary and reflects on the achievements and contributions of the individuals who have played a significant role in its growth and success.

Save on AGA Event Registration

Not yet a member of AGA and WANT TO SAVE? Apply and become an AGA Member before Tucson to receive substantial registration savings on these and other events. Learn about AGA Membership and how to apply & SAVE!

AGA Membership

Accredited Gemologists Association is a professional peer society providing a network for sharing gemological information and skills. AGA proudly counts some of the world’s leading gemologists as members and is internationally respected as a premier gemological organization.

As an AGA member, you gain:

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An Opportunity to support AGA's Mission – become an AGA Sponsor or Donor

AGA is a nonprofit 501(C)(3) organization dedicated to promoting the highest standards in Gemological Education, Research, and Ethics. Your donation will allow AGA to provide Gemological Education Scholarships, Fund Gemological Research Projects, and expand our Positive Roles in the world of Gemology.

Read more about becoming an AGA sponsor or donor…

Please consider supporting these donors as they support the mission of AGA:

  • Steve Wexler, Wexler Insurance Co.
  • Center for Curiosity, Kushal Sacheti & Galaxy USA Inc.
  • Art Samuels,
  • Mark Cullinan, Cullinan Diamonds

About the AGA Gemological Research Grant…

About the AGA Gemology Scholarship Program…

About the Accredited Gemologists Association

Established in 1974, AGA was envisioned as a network for sharing gemological information and skills. The international Accredited Gemologists Association of today proudly counts among our members some of the world’s leading independent gemologists.

The AGA is an independent, international, nonprofit organization dedicated to…

Gemological Education & Research
Identification & Evaluation of Gem Materials
Development of Professional Standards of Analysis, Practice & Ethics

We are an organization of all beliefs and cultures and share a common bond of the love of gemstones. AGA believes in excellence and is dedicated to establishing the highest professional standards of practice.

The annual AGA Board Meeting is held the day before the Tucson AGA Conference, while the annual AGA Membership Meeting is held the day of the Tucson AGA Conference. Both events are held in the same facility as the AGA Conference.

For more details about our organization, please view the following organizational documents. (.pdf files)

Voting Membership is available to anyone holding an acceptable credential from the Gemological Institute of America, Gemmological Association of Great Britain, Canadian Gemmological Association, or other school of gemology as approved by the AGA Board of Governors. Non-voting memberships are available to others as Associates, Students, or Corporations.

Officers & Board of Governors for 2/2023–2/2026


President: Teri Brossmer, GG, MGA®
Vice President: Çiğdem Lüle, PhD, FGA, GG (GIA), DGA
Treasurer: Heidi Harders, GG
Secretary: Adam Ostrow, GG
Immediate Past President: Stuart Robertson, GG

Board of Governors

Gina D'Onofrio, FGA, FGAA, MGA®
Donna Hawrelko, FGA, FCGmA
Antoinette Matlins, PG, FGA
Alberto Scarani, IGI-GG
Gary Roskin, GG, FGA
Martin Fuller, GG (GIA), FGA


Educational Standards and Outside Association Relationship Committee:Donna Hawrelko
Educational Committee: Heidi Harders with Çiğdem Lüle & Donna Hawrelko
Certified Gemological Laboratory Committee: Gary Smith & Richard Hughes
Membership Committee: Renee Newman
Bonanno Award Committee: Stuart Robertson, with former Bonanno Award recipients Christopher Smith, Richard Hughes & Shane McClure
Sponsorship Committee: Teri Brossmer, with Alanna Campbell, Barbara Kolatar, Douglas Liebman
Education Scholarship & Research Grants Committee: Heidi Harders, with Breanne Avender, Jane Chaikowsky & Çiğdem Lüle

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