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AGA Antonio C. Bonanno Award for Excellence in Gemology

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AGA Membership

As a professional peer society, we believe in excellence and are dedicated to establishing the highest ethical and professional standards of practice. As a member, you gain peer recognition for active participation in educational programs and industry forums gaining the personal satisfaction of improving your skills while contributing to your profession.

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Continuing Education

We encourage you to enhance your experience and knowledge through taking classes. We recommend that you take ASA, GIA, AGS, ISA and NAJA workshops all through the year to accomplish this.

AGA strives to offer 2 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 Members can achieve certification by fulfilling the highest equipment standards and compliance with the AGA code of ethics. (Print the Gem Lab Certification application.)

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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Consumer & Industry ALERT!!!

AGA is NOT a laboratory...

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AGA Tucson Conference Wednesday, February 5, 2020...

All ASA Gem Related Courses...

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GGTL Lab Report - A scam with international ramifications concentrating on colorless diamonds of high color grades

Update - Lead Glass Filled Rubies & Sapphires from Tucson - Feb. 2013
Discovered during Raymond Mason's 2012 trip to Thailand - Composite rubies and sapphires.

AGA's FTC report...

See what we enjoyed at the
2020 AGA Tucson Gemological Conference

Robert Weldon Received the 2020 Antonio C. Bonanno Award for Excellence in Gemology

Robert Weldon

Robert Weldon, Director of the RTL Gemological Library & Information Center at GIA, to receive the Antonio C. Bonanno Award for Excellence in Gemology for 2020.

During his career Robert has taught gemology, worked as a journalist at both JCK and Professional Jeweler, he has photographed some of the most important gem and jewelry collections known and he has published and lectured extensively on wide range of gemological issues.

Read more about Robert here...



AGA Educational Scholarship awarded to Xabrina-Michel'li Thompson

Xabrina thanked AGA Members & supporters saying, "Thank you for enabling me to reach my fullest personal and professional potential. It is my ambition to be able to help struggling students reach their goals in higher education by assisting them in the same way you are helping me. Thank you very much for your generosity."



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 by Antonio "Tony" Bonanno (as alumnae of the Gemmological Association of Great Britain), AGA was envisioned as a network for sharing gemological information and skills. Graduate gemologists of the Gemological Institute of America joined in 1975. The international Accredited Gemologists Association of today proudly counts among our members some of the worlds 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 AGA Annual Board Meeting will be held in Tucson, the day before the AGA Conference. The AGA Annual Membership Meeting will be held in Tucson, the day of the 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 either Associates, Students, or Affiliates.

Click here to apply for AGA Membership.

Officers & Board of Governors for 2/2020-2/2023

President: Teri Brossmer, GG, MGA®
Vice President: Ted Irwin, GG
Secretary: Heidi Harders, GG
Treasurer: Adam Ostrow, GG
Immediate Past President: Stuart Robertson, GG

Board of Governors

Gina D'Onofrio, FGA, FGAA, MGA®
Donna Hawrelko, FGA, FCGmA
Richard Hughes, FGA
Dr. Cigdem Lule, FGA, GG (GIA), DGA
Raymond Mason, GG
Antoinette Matlins, PG, FGA


Educational Standards and Outside Association Relationship Committee: Donna Hawrelko
Conference Committee: Ted Irwin & Donna Hawrelko, with Antoinette Matlins, Gary Smith, Craig Lynch, Raymond Mason, Art Samuels, Patti Schrag, Melissa Allen
Certified Gemological Laboratory Committee: Gary Smith
Membership Committee: Christine York
Bonanno Award Committee: Stuart Robertson with former Bonanno Award Recipients Christopher Smith, Richard Hughes, & Shane McClure
Sponsorship Committee: Teri Brossmer with Art Samuels
Education Scholarship & Research Grants Committee: Heidi Harders with Jane Chaikowsky, & Cigdem Lule, PhD

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