Accredited Gem Lab

Accredited Gem Laboratory

Professional Gemological Identification Services

MicroscopeThe Accredited Gem Lab® (AGL) designation means the firm you are shopping with has the minimum equipment required to perform gemological testing and appraisals. The equipment includes a gemological darkfield binocular microscope (essential for gemological observations), a master color grading set graded by AGS Laboratories per American Gem Society (AGS) Standards (for reliable color comparisons of diamonds), a gemological library of reference materials, and more.

Firms with the Accredited Gem Lab® designation prove to their customers and clients they are vested in the thorough inspection of gemstones and jewelry. More importantly, each Accredited Gem Lab® is required to have an AGS titleholder on staff, with a minimum of a Certified Gemologist® (CG) or Certified Gemologist® Appraiser (CGA) title to oversee its use. This ensures that a fully-credentialed gemologist with the proper knowledge is responsible for gemological testing and appraising.

To apply for the AGL designation, complete and submit the application listed below to


Accredited Gem Lab Documents

Item Name Posted By Date Posted
Accredited Gem Lab Requirements PDF (278.69 KB) Administration 10/7/2020
Accredited Gem Lab Application PDF (197.64 KB) Administration 8/11/2020
Color Master Requirements PDF (1.52 MB) Administration 3/5/2020

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