Diamond Quality Certificate
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Diamond Grading CertificateThe Diamond Quality® Certificate is a super-powered grading report prepared by the AGS Laboratories exclusively for American Gem Society retail jewelers. It is a Diamond Quality® Document plus a guaranty from the participating American Gem Society member store. 

A diamond grading report is an opinion of the laboratory issuing the report. Although the diamond grading report is an expert opinion it is not a guaranty from a legal perspective. The Diamond Quality® Certificate is a legal statement from the issuing AGS retailer, guaranteeing authenticity and quality, as well as certifying the diamond cut grade, color grade, clarity grade, and carat weight of the diamond.

The Diamond Quality® Certificate is authenticated and validated by an American Gem Society diamond professional — either a Registered Jeweler, Certified Gemologist, or Certified Gemologist Appraiser. Their commitment to the tenets of the American Gem Society — Proven Ethics, Knowledge, and Consumer Protection — is your assurance of quality and value.

Have questions or comments? Contact AGS Laboratories.


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