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Founded in 1943, The American Gem Society (AGS) is dedicated to upholding the highest ethical standards in the diamond and jewelry industries. Professional and consumer education are AGS priorities, and the society offers courses to all segments of the diamond industry.

The AGS established a laboratory in 1996 to provide modern diamond grading services for the diamond marketplace. Its conservative approach to diamond grading has made the AGS one of the world's most respected gemological laboratories.

The AGS was the first diamond laboratory to issue a separate grade for diamond cut and to include that grade in each diamond report. Many laboratories have yet to catch up with innovations the AGS pioneered a decade ago.

AGS Diamond Quality Reports provides this information:

  • Description
  • Shape and Cut
  • Weight
  • Measurements
  • Pavilion Depth Percentage
  • Depth Percentage
  • Table Percentage
  • Crown Angle
  • Crown Height Percentage
  • Pavilion Angle
  • Culet Size
  • Girdle Thickness
  • Polish/Symmetry
  • Color Grade
  • Clarity Grade
  • Cut Grade
  • Fluorescence
  • Comments about Diamond
  • Plot of Internal and External Inclusions