Gemological Laboratory Name:
The name of the laboratory that is issuing the diamond certificate/grading report.
Certificate Reference Number/Report #:
The diamond certificate/grading report number specific to a particular diamond.
Date:
The date a diamond certificate/grading report was completed.
Shape and Cutting Style:
The shape of a diamond.
Weight:
The weight of a diamond in carats.
Color:
The color grade of a diamond.
Clarity:
The clarity grade of a diamond.
Dimensions/measurements:
The length, width and depth of a diamond in millimeters.
Table:
The proportions of a diamond as it relates to the
table percentage.
Depth:
The proportions of a diamond as it relates to the depth percentage.
Crown:
The proportions of a diamond as it relates to the crown
height percentage.
Pavilion:
The proportions of a diamond as it relates to the pavilion depth percentage.
Girdle:
A description of the characteristics of the girdle of a diamond.
Culet:
A description of the characteristics of the culet of a diamond |
Polish:
A grade performed by a gemologist or team of gemologists that describes how well a diamond is polished.
Symmetry:
A grade performed by a gemologist or team of
gemologists that describes how proportionate the crown and pavilion are on a diamond as well as the degree to which the culet is centered underneath the table.
Fluorescence:
Some diamonds contain fluorescence. It is preferred that a diamond with a color grade of D – H have the following fluorescent grades: none, faint blue, very slight blue or slight blue. Any stronger degree of fluorescence than these will retract from how light refracts off your diamond and will, therefore, not be as brilliant. However, stronger fluorescent grades, such as moderate blue, strong blue, and distinct blue, in diamonds that have a color grade of I – M, are sometimes preferred because the stronger fluorescence detracts from the yellowish tints of these diamonds.
Cut Grade:
A grade performed by a gemologist or team of gemologists that describes how well the overall proportions of a round brilliant cut diamond are using the following characteristics: total depth, table size, crown angle, pavilion angle, star length, lower-half (lower-girdle facet) length,
girdle thickness, and culet size, as well as the diamond's polish and symmetry grades.
Inscription:
A laser inscription can be found on the girdle of a diamond. This can help identify a specific diamond.
Comments:
Any additional notes a gemologist or team of gemologists believe is prudent to the diamond.
Inclusion Plot Diagram with Key to Symbols: A diagram of the shape of the diamond presented on the diamond certificate/grading report with a plot of where the inclusions are located on a specific diamond as well as the type of inclusions on a specific diamond. A Key to Symbols is similar to that of a legend on a map. It will define the types of inclusions plotted on the Inclusion Plot Diagram.
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