Accredited Gem Laboratory
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Accredited Gem Laboratory

 The American Gem Society Accredited Gem Laboratory -
Professional Gemological Identification Services

Accredited Gem Lab image Accredited Gem Laboratory Certificate

The American Gem Society Accredited Gem Lab is a special designation awarded to select members that have met the strict requirements listed below:

  • A permanent designated laboratory space
  • Diamond scales that measure carat weight to 0.002 carat accuracy
  • Binocular microscope with at least 10X magnification
  • Leveridge gauge or millimeter gauge for measuring diamonds and color gemstones
  • Diamond grading light source for evaluating diamond color
  • Master Color Comparison diamonds for evaluating diamond color
  • Refractometer - testing of color gemstones
  • Polariscope - testing of color gemstones
  • Dichroscope - testing of color gemstones
  • Long wave and short wave UV light source - testing of diamonds and color gemstones
  • Specific gravity liquids or scale attachment - testing of color gemstones
  • A gemological reference library - source of information regarding the identification, evaluation and valuation of diamonds and color gemstones


  • A Certified Gemologist® or Certified Gemologist Appraiser American Gem Society® on staff to oversee the proper use of the equipment and library.

Contact for an application.


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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

8881 W. Sahara Ave. Las Vegas, NV 89117 (866) 805-6500