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On this page, you can easily download the Diamond Grading Standards, as well as a summary of the Standards that helps you talk to your customers and convey its importance in the history of the AGS and our industry.

For a copy of the complete transcript of Al Woodill’s historic interview on the AGS Diamond Grading Standards, please email

AGS Diamond Grading Standards Downloads

Item Name Posted By Date Posted
1966 Diamond Grading Standards PDF (4.58 MB) Administration 8/28/2017
AGS Diamond Grading Standards Quick Glance PDF (59.85 KB) Administration 8/28/2017

Mission Statement

The American Gem Society (AGS) is a nonprofit trade association of fine jewelry professionals dedicated to setting, maintaining and promoting the highest standards of ethical conduct and professional behavior through education, accreditation, recertification of its membership, gemological standards, and gemological research.

The Society is committed to providing educational products to inform and protect the consumer and to contributing to the betterment of the trade by creating industry standards to protect the jewelry-buying public and the fine jewelry industry as a whole.

AGS Laboratories, founded to support the AGS mission, is a nonprofit diamond grading laboratory with a mission of consumer protection. Adhering to the AGS Diamond Grading Standards, AGS Laboratories is dedicated to offering diamond grading reports that provide consistency and accuracy based on science.

American Gem Society