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Reading a Grading Report

A Diamond Grading Report states specific characteristics of a diamond. Grading labs such as the Gemological Institute of America (G.I.A.) issue these reports.
 
Characteristics Graded in the Report 
 
Cut Grade
A grade determined by a diamond's table-up appearance. This takes in consideration the design and craftsmanship.
 
Shape and Cutting Style
Graded on the diamond shape and cutting style.
 
Color Grade
This grade is based on the absence of color in a diamond.
 
Clarity Grade
The clarity grade determined what can be seen under 10x magnification.
 
Carat Weight
The weight of diamond to the nearest hundredth of a carat.
 
Measurement
The diamond's dimensions in millimeters.
 
Polish
Rates the smoothness of the diamond's surface.
 
Symmetry
A grade based on the shape, depth, alignment and arrangement of the diamond's facets, along with the evenness of the outline are graded.
 
Finish
A grade that represents a diamond's overall appearance – its surface, polish, and facet placement.
 
Fluorescence
The reflection of color when the diamond is viewed under UV light.
 
Clarity Plot
A map of the approximate size, type, and position of all the inclusions that can be seen under a microscope.
 
Proportion Diagram
A map of the diamond's actual proportions.
 
Comments
Notes and details describing additional diamond characteristics not already mentioned in the report.
 
Reading the Diagram
 
Proportion diagrams will include the following information:
 
Depth
The height of a stone measured from the culet to the table.
 
Table
Flat, top facet of the diamond. The largest facet of a diamond.
 
Girdle
Part that separates the top and bottom of the diamond. This can range in thickness and will be graded accordingly.
 
Culet
The tip of the bottom of the diamond. This is the most fragile piece of the stone. The appearance of this is graded.
 
 
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