GIA Diamond Report

Learn How To Read a Diamond Grading Report
A diamond grading report isn’t an appraisal; it’s the scientific blueprint of a diamond’s exact quality characteristics and is vital in assuring its quality and proof of your diamond’s identity. When purchasing a diamond from Diamonds 27, you’ll receive the original diamond grading report or dossier from the GIA (Gemological Institute of America) – the world’s foremost authority on diamonds and the most internationally recognised.

The GIA Diamond Grading Report contains scientifically determined information on diamond shape, cut, colour, carat weight, clarity, a plotting diagram that clearly shows a diamond's inclusions, proportions and finish. It also identifies any known treatments. Other reports from other entities have since made their way into the marketplace, but GIA is recognised as the original and unrivalled source for accuracy and integrity in diamond grading.

Video: How to read a GIA Diamond Grading Report

Diamonds 27 How to read a GIA Diamond Grading Report Certificate


Example of a GIA Diamond Grading Report:

Example of a GIA Diamond Grading Report and Certificate

How to read a GIA Diamond Grading Report

Every diamond has a unique set of characteristics that acts as a fingerprint and determines its value. A diamond report from the GIA, also known as a diamond dossier, is a formal document detailing a diamond’s unique characteristics, especially its cut, carat weight, colour and clarity, and may also include its finish (polish and symmetry), fluorescence and additional comments.  The report provides the kind of evidence that is vital to a confident diamond purchase.
It’s important to note that a diamond grading report is not the same as an appraisal or valuation certificate. The diamond grading report states the characteristics of a diamond, but does not place a monetary value on the stone.  If you want to insure your diamond, you’ll need an appraisal or valuation certificate which is a written estimate of the approximate retail replacement value of the item described. 

You will receive a GIA Grading Report with your purchase from Diamonds 27. The report will contain the following information:

  • A unique report number (e.g.: 1105994015)
  • A description of the shape of the diamond (e.g.: Round Brilliant Cut)
  • The carat weight of the diamond (e.g.: 0.50ct)
  • The colour of the diamond (e.g.: E)
  • The clarity of the diamond (e.g.: VS2)
  • The length, width and depth of the diamond in millimetres (5.10 - 5.11 x 3.16 mm)
  • A description of the cut grade (e.g.: Very Good)
  • The quality of the diamond's polish (e.g.: Very Good)
  • The quality of the diamond’s symmetry (e.g.: Excellent)
  • The presence or absence of fluorescence in the diamond (e.g.: None)
  • The total depth percentage and table percentage of the diamond (e.g.: 61.9% and 57% respectively)
  • A  description of the girdle's appearance (e.g.: Thin to Medium)
  • A description of the culet (e.g.: None)

Some GIA reports may also contain the following additional information:

  • A plot of the clarity characteristics in the diamond. Useful to see where the inclusions are, if any.
  • Clarity characteristics describing the type of inclusions or blemishes (e.g.: Feather, Cloud)
  • Additional comments if necessary
  • Additional inscriptions

All GIA reports contain security features such as a hologram, security screen and micro-print lines that prevent them from being forged or duplicated. The report provides the kind of clear evidence that is vital to a confident purchase. GIA's innovations have been adopted universally and today virtually every diamond is described using the language GIA developed.

Learn more about the GIA - Diamond Grading Laboratory.