An AGG Certificate clearly discloses the details of any item it accompanies, providing confidence for both buyer and seller.

AGG reports represent the highest standard of reliability, consistency and integrity. And now, AGG Report Verification is available for all AGG reports, providing you with an additional level of assurance. With Report Verification, you can quickly and conveniently confirm that the information on your report matches what is archived in the AGG report database.

Fun with Jewelry

Fun with Jewelry

We’ve been making it easier and safer to buy jewelry of any kind. Even if you don’t know the first thing about cut and clarity, we can help you, educate you, and point you in the direction of jewelers that are dedicated to protecting you.

We're an AGS Jeweler video
Fun with Jewelry
Fun with Jewelry



Mission Statement

The American Gem Grading Laboratory (AGG) 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 Laboratory 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.

AGG Laboratory, is a gemstone and diamond grading laboratory with a mission of consumer protection. Adhering to the 4C Diamond Grading Standards, AGG Laboratory is dedicated to offering gemstone and diamond grading reports that provide consistency and accuracy based on science.

American Gem Grading Laboratory

room 4038,floor 4,No.59 XINJIEKO xicheng district beijing.