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Carlsbad, CA--The American Gem Society (AGS) proudly presented the prestigious Robert M. Shipley Award to Al Gilbertson, CG, during Converge 2025, held on September 7 - 10. The Shipley Award, the Society’s highest honor, recognizes Gilbertson’s lifetime of excellence in gemological research, education, and service to the industry.

“Al’s ability to bridge scientific precision with an understanding of diamond beauty has helped elevate our industry,” said Katherine Bodoh, CEO of the American Gem Society. “We are deeply grateful for his contributions and proud to honor him.”

[From left: Susan Jacques and Al Gilbertson with the Robert M Shipley Award]

Gilbertson joined GIA in 2000 as a researcher. He is one of the inventors of GIA’s cut grading system for round brilliant diamonds, and his name appears on several of the patents related to that system. He is part of the GIA team studying the influence of proportions and other factors on the appearance of fancy-shaped diamonds, working toward the development of a cut grading system for those shapes.

“Al’s impact on the gemological field is profound,” said Susan Jacques, GIA president and CEO, who presented the award on September 9. “His work is at the heart of how we evaluate the quality of a diamond’s cut. He brings curiosity, precision and an enduring passion for excellence to every project, and his legacy will continue to guide gemological science for generations to come.”

Gilbertson’s book, “American Cut — The First 100 Years,” is widely regarded as the definitive work on the subject. Before his time at GIA, Gilbertson brought decades of experience as a jeweler, lapidary artist, appraiser and business owner.

A Graduate Gemologist since 1979 and Certified Gemologist through AGS the same year, Gilbertson has spent decades shaping both practice and theory in the gemological field. His early career spanned jewelry restoration, custom cutting, lapidary work, and appraisal services.