How to read a GIA diamond certificate
Each diamond is unique, with a range of characteristics that act as its “fingerprint.” These characteristics determine the diamond’s value, and are recorded on a diamond certificate.
The GIA Diamond Certificate is a formal document containing a diamond’s unique details. These details include the 4Cs (a diamond’s cut, clarity, colour and carat weight), the diamond’s finish (polish and symmetry), fluorescence, diagrams of the diamond’s proportions and additional comments.
The GIA Diamond Dossier also includes an assessment of the 4Cs and a microscopic laser inscription of the GIA report number, aiding identification. The Diamond Dossier is only for loose diamonds, D-Z colour, weighing 0.15 to 1.99 carats.
A GIA Diamond Certificate will contain the following information:
- A unique certificate 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 millimeters (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)