GIA Diamond Grading Report
The four Cs are assessed in the Diamond Grading Report that is provided by the GIA. These are Carat Weight, Cut, Clarity, and Color. The GIA also provide a graphic representation of the proportions of the diamond as well as a plotted diagram that displays the clarity characteristics. This report is only issued for natural, loose diamonds that weigh 0.15 carats or more. A GIA Cut grade is also provided for any standard Round Brilliant diamonds that are ranked between D and Z in terms of color.
The date the GIA evaluated the diamond.
2. REPORT NUMBER
All reports have a unique number as assigned by GIA.
3. CUTTING STYLE AND SHAPE
The cutting style refers to the facet arrangement pattern, and the shape is the outline of the diamond.
The dimensions of the diamond are listed as 'minimum diameter'. For fancy shaped diamonds, this is length multiplied by width multiplied by depth. For round diamonds, this is maximum diameter multiplied by depth.
5. CARAT WEIGHT
The weight is provided in carats, which is the official measurement for diamonds. One carat equates to a fifth of a gram. It is recorded to the nearest hundredth of a carat.
6. COLOR GRADE
The colour of the diamond is ranked from D to Z, with D being a colorless diamond and Z representing a diamond with an evident yellow shade. A * may be next to the color grade if the grader spotted a treatment. They will expand on this in further detail in the comment section.
7. CLARITY GRADE
Clarity relates to the blemishes and inclusions on the diamond, assessing their position, number, and size under 10x magnification. Flawless is the top ranking for this.
8. CUT GRADE
This grade is only for Round Brilliant diamonds that are graded between D and Z in terms of color. This is used to assess the craftsmanship, design, and face-up appearance of the diamond. It is graded from Excellent to Poor.
Assessed on a scale from Excellent to Poor, polish relates to the smoothness of the surface of the diamond.
Also based on a scale from Excellent to Poor, the symmetry looks at the outline of the diamond, the alignment of its facets, as well as the shape and placement.
Used to identify the presence off any fluorescence in a diamond. 'None' signifies anything from indiscernible to very faint fluorescence.
12. INSCRIPTION (S)
Anything that has been inscribed on the girdle of the diamond, such as unique GIA report number, logos, symbols, or text.
This relates to anything that has been identified that has not already been stated on the report, for example, laser drilling or any other treatment.
14. PROPORTION DIAGRAM
Diamond's actual proportions represented in a graphic profile.
15. PLOTTED DIAGRAM
Cutting style and shape of the diamond are approximated. Symbols used to indicate clarity characteristics, such as their nature, size, and position.
16. KEY TO SYMBOLS
List of the symbols and characteristics on the plotting diagram, if applicable.
17. GIA COLOR SCALE
Showcases the GIA Color grades as well as their positions in the GIA Diamond Color Grading System.
18. GIA CLARITY SCALE
Showcases the GIA Clarity grades as well as their positions in the GIA Diamond Clarity Grading System.
19. GIA CUT SCALE
Showcases the GIA Cut grades as well as their positions in the GIA Diamond Cut Grading System. This is applicable to Round Brilliant diamonds that are ranked from D to Z on the color range.
20. SECURITY FEATURES
This includes the likes of holograms, two-dimensional barcodes, watermarks, security screens, micro-printing, and such.
21. QR CODE
This is a two-dimensional barcode that verifies the data featured on the report against the GIA database when it is scanned.