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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.

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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.)

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

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AGA Tucson Conference - Wednesday, January 31, 2018

NAJA ACE© It Education Tucson
January 28-29


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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...

2018 AGA Tucson Conference - See what you missed!

Save the date - Friday afternoon, June 1, 2018 - AGA half-day Las Vegas Conference

Dr. William "Bill" Hanneman Awarded the 2018 AGA Antonio C. Bonanno Award for Excellence in Gemology

Dr. Hanneman with his friend and
AGA's first award recipient - Alan Hodgkinson

The AGA is pleased to announce that Dr. Hanneman is the recipient of the 2018 AGA Antonio C. Bonanno Award for Excellence in Gemology.

Dr. Hanneman's contributions to the gemological community are many. From education to his various innovative tools, Bill Hanneman's body of work is of profound benefit to gemology. "Dr. Hanneman has dedicated decades to providing gemologists with practical solutions to many of gemology's big challenges. It would difficult to think of anyone more deserving of this recognition," said AGA President Stuart Robertson.

Bill Hanneman exemplifies what the AGA Bonanno Award represents: gemological expertise and excellence in gemological practice, research, and education, and a dedication to sharing gemological knowledge through formal teaching and professional collaboration. Dr. Hanneman has authored a number of books, including: Guide To Affordable Gemology, Pragmatic Spectroscopy for Gemologists, Diamond Cut Grading Simplified, and Naming Gem Garnets, all of which were motivated by Bill's desire to make gemological information affordable and thereby assessable to anyone interested in exploring the subject.

Hanneman's many tools are notable because they filled a gap for something portable, affordable, & practical. They include the Diamond Eye, a reflectivity meter providing RIs for gems that with RI values over 1.80; the Diamond Eye provided readings for such gems as diamond and synthetic moissanite, CZ and other diamond look-alikes. Another Hanneman tool provided not only an RI, but birefringence and dispersion for faceted gems, with RI values up to 2.37 (and without the need for toxic liquids). His color filters, developed in collaboration with Alan Hodgkinson, provided quick and easy pre-screening ID, and his specific gravity balance was the first to provide direct readings, even for gems weighing under one carat.

Dr. Hanneman's work parallels that of Mr. Bonanno's distinguished career, it's a life-long body of exceptional work inspired by a desire to share his work and knowledge with gemologists everywhere, students and professionals alike. His contributions to the field of gemology have had a tangible impact on gemologists, universally.

The AGA Award was presented at AGA's Gala Dinner Dance at the conclusion of its Tucson Conference. The award included a personalized plaque and $2000.00 research honorarium funded by the AGA membership.

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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,

2018 AGA Research Grant - now taking applications

The Accredited Gemologists Association (AGA) is offering a research grant to support research on gemological issues relevant to the trade. Learn more about the AGA Research Grant Application...

About Dr. Hainschwang's 2017 Research Grant Award...

About the AGA Gemological Education Scholarship

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 Board of Directors. 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 2017-2019

The Accredited Gemologists Association (AGA) slate of officers and board members:

President: Stuart Robertson, GG
Vice President: Teri Brossmer, GG
Secretary: Raymond Mason, GG
Treasurer:Adam Ostrow, GG
Immediate Past President: Donna Hawrelko, FGA, FCGmA

Board of Governors

Breanne Avender, FGA, FCGmA
Heidi Harders
, GG
Ted Irwin
, GG
Gary Smith, GG
Art Samuels, GG
Patti Schrag, GG

Special Advisor to the AGA Board : 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
Certified Gemological Laboratory Committee: Carole Richbourg
Membership Committee: Christine York
Bonanno Award Committee: Stuart Robertson with Christopher Smith, Richard Hughes & Shane McClure, Dr. John Emmett
Sponsorship Committee: Teri Brossmer with Art Samuels
Education Scholarship & Research Grants Committee: Heidi Harders with Jane Chaikowsky & Cigdem Lule, PhD

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