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Diamond Certification

Diamond Certification

What is a Diamond Certificate?

  • Definition: a diamond certificate is an official document issued by a gemological laboratory detailing the attributes of the diamond.

Major Certification Bodies

  • GIA (Gemological Institute of America): Known for its strict grading standards and detailed reports.
  • AGS (American Gem Society): Provides detailed grading with a focus on cut quality.
  • IGI (International Gemological Institute): Widely recognized, especially for lab-grown diamonds.
  • EGL (European Gemological Laboratory): Known for more lenient grading compared to GIA and AGS.

What to Look for in a Certificate

  • Grading Report: Includes details on the 4 Cs and other characteristics like fluorescence.
  • Laser Inscription: Some diamonds have a laser inscription on the girdle that matches the certificate number for verification.
  • Authenticity and Transparency: Certificates provide assurance of the diamond’s quality and authenticity.

GIA (Gemological Institute of America) Certification Sample

Diamond Grading Report

  1. Report Number: 1234567890
  2. Shape and Cutting Style: Round Brilliant
  3. Measurements: 6.50 - 6.52 x 3.94 mm
  4. Carat Weight: 1.00 carat
  5. Color Grade: D
  6. Clarity Grade: VS1
  7. Cut Grade: Excellent
  8. Polish: Excellent
  9. Symmetry: Excellent
  10. Fluorescence: None
  11. Inscription(s): GIA 1234567890 (laser inscribed on the girdle)


  • None


  • Inclusions and blemishes location and type (plot)

Proportion Diagram:

  • Detailed cut proportions (table size, crown angle, pavilion angle, etc.)

AGS (American Gem Society) Certification Sample

Diamond Quality Document

  1. Document Number: 9876543210
  2. Shape and Style: Princess Cut
  3. Carat Weight: 1.20 carat
  4. Color Grade: AGS 0 (Colorless)
  5. Clarity Grade: AGS 2 (Very Slightly Included)
  6. Cut Grade: AGS Ideal 0
  7. Polish: AGS Ideal 0
  8. Symmetry: AGS Ideal 0
  9. Proportions: AGS Ideal 0
  10. Fluorescence: Negligible


  • Laser Inscription: AGS 9876543210

Proportion Analysis:

  • Table percentage, depth percentage, crown angle, pavilion angle

Light Performance Map:

  • Analysis of light performance, showing brightness, fire, and scintillation

IGI (International Gemological Institute) Certification Sample

Diamond Report

  1. Report Number: 1122334455
  2. Shape and Cut: Oval Brilliant
  3. Carat Weight: 1.50 carat
  4. Color Grade: E
  5. Clarity Grade: SI1
  6. Cut Grade: Very Good
  7. Polish: Very Good
  8. Symmetry: Very Good
  9. Fluorescence: Faint


  • Inscription: IGI 1122334455


  • Inclusions and blemishes (plot)


  • Detailed measurements and angles

EGL (European Gemological Laboratory) Certification Sample

Diamond Certificate

  1. Certificate Number: 5566778899
  2. Shape: Pear Shape
  3. Carat Weight: 2.00 carat
  4. Color Grade: F
  5. Clarity Grade: VVS2
  6. Cut Grade: Excellent
  7. Polish: Excellent
  8. Symmetry: Excellent
  9. Fluorescence: Medium Blue


  • Laser Inscription: EGL 5566778899


  • Detailed plot of inclusions and blemishes

Proportion Diagram:

  • Detailed proportions and measurements
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