Pictured above is the most complete diamond grading report available. The proprietary Light Performance Diamond Quality Document (DQD) from the American Gem Society Laboratory (AGSL), featuring complete diamond grading information.
The format of the lab report is as follows:
1. is the lab report number, this is the reference to the diamond and the corresponding data.
2. is the shape of the diamond and the measurements of the outside diameter and depth of the diamond in millimeters.
3A is the overall Cut Grade of the diamond which is based upon the individual factors Light Performance, Polish and Symmetry as outlined in 3B, note that it also takes the proportions of the diamond into account as indicated on the plotting diagram (8).
4. is the color grade of the diamond stated as a numeric value with reference to the GIA equivelent grade.
5. is the clarity grade of the diamond stated as a numeric value with reference to the GIA equivalent grade.
6. is the carat weight of the diamond.
7. the Comments section is used declare the fluorescence grade of the diamond, as well as define any additional clarity characteristics such as minor inclusions that are not substantial enough to be noted on the plotting diagram (areas 9 and 10 on the lab report) so you might see something like “pinpoints not shown” and an indication that the diamond has been inscribed with the lab report if applicable. Note that in this particular instance, there is also a reference to Brian Gavin Diamonds because the inscription reads “Brian [diamond symbol] Gavin and the number from the corresponding AGS Diamond Quality Document.
8. is a scale version of the profile of the diamond based upon the actual proportions of the diamond. In this particular instance, the Brian Gavin Diamonds logo indicates the brand of the diamond being graded. In addition, the logo section located above the proportions diagram also includes the “Cut Beyond Brilliant” tag line of Brian Gavin Diamonds which does not reflect a definitive statement being made by the AGS Laboratory.
8a. is the table diameter of the diamond stated as a percent.
8b. is the total depth of the diamond stated as a percent.
8c. is the crown angle of the diamond stated in degrees. Note that the crown height percent is indicated directly across the diagram from the crown angle.
8d. is the pavilion angle of the diamond stated in degrees. Note that the pavilion height percent is indicated directly across the diagram from the pavilion angle.
8e. is the girdle size and finish of the diamond stated in percent.
8f. is the culet size of the diamond, the AGS uses the term “pointed” where the GIA uses the term “none” to represent the smallest size of culet (bottom point).
9. is a plotting diagram which represents the top portion of the diamond.
10. is a plotting diagram which represents the bottom portion of the diamond.
The red star that we placed between the three o’clock position of the upper plotting diagram (9) and the nine o’clock position of the lower plotting diagram (10) represents where the two halves of the diamond that are located in alignment with each other. Thus if a feather were indicated in that region of both the upper and lower halves of the plotting diagrams, it would be located in the exact same region of the actual diamond. The three o’clock position of the lower plotting diagram folds under to align with the nine o’clock region of the upper plotting diagram.
11. is the “Key to Symbols” which indicates the type of inclusions contained within the diamond as indicated on the upper and lower plotting diagrams. In this particular instance, the inclusions located within the diamond consist of a “cloud” which is a small cluster of pinpoint size diamond crystals which is located within the table facet of this diamond and a few tiny feathers which are located within the top half of the diamond as indicated in the six o’clock region of the upper plotting diagram. We used light green colored arrows to indicate the location of the inclusions which are indicated in red by the AGS Laboratory on the DQD, the green arrows are not part of the lab report.
Note that earlier copies of AGS lab reports listed all of the inclusion types beneath the Key to Symbols and that newer AGS lab reports list only the specific inclusions contained within the diamond described on the lab report.
12. is the AGSL Light Performance Map for the Diamond which is created using ASET (Angular Spectrum Evaluation Tool) it is intended to provide insight into where the diamond gathers light from within the atmosphere of the model which is designed to simulate the lighting conditions provided by our hemisphere.
The square bar code which appears in the upper left corner of the Light Performance Diamond Quality Document is a “QR Code” which enables people with a smart phone to use the scanner on their phone to scan the bar code and then verify the lab report online with the AGS Laboratory. You can also click here to verify a diamond grading report issued by the AGS Laboratory and do so by entering the lab report number which in this particular instance is 104061350005 and the carat weight which is 1.380 and clicking on the Submit button. A high resolution of the lab report is available on the AGS web site by clicking on the option for “Open Report” and it can be magnified using the tools which appear when you mouse over the blank section to the lower right of the lab report which will appear. On the Brian Gavin Diamonds web site, you can use the link provided to “Verify Lab Report” which links directly to the corresponding lab report on the AGS server… Click here to open the diamond details page for the 1.380 carat, F color, VS-1 clarity diamond from Brian Gavin Diamonds used in this tutorial and then click on the link to “Verify Lab Report”.