Gemological Laboratory Name: The name of the laboratory that is issuing the diamond certificate/grading report.

Certificate Reference Number/Report Number: 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 description of the outline of the diamond (shape) and the pattern of the facet arrangement (cutting style). More about Color.

Weight:  The weight of a diamond given in carats.  One carat is equal to 1/5 of a gram.  In keeping with internationally recognized practice, weight is recorded to the nearest hundredth of a carat.

Color: The color grade of a diamond or, more appropriately, the lack of color.  The color scale is given in a scale from D to Z, with D through F considered to be colorless, G through J considered to be near colorless, and lower grades showing a noticeable yellow color. More on Color.

Clarity: The clarity grade of a diamond which measures the absence of inclusions (internal flaws) and blemishes (external flaws).  More on Clarity.

Dimensions/measurements: The length, width and depth of a diamond in millimeters.

Table: The largest facet of a diamond located on what is commonly referred to as the top of the diamond. 

Culet: The facet at the bottom point of a diamond.  It is preferable if the culet is not visible with the bare eye.

Crown: The top part of a diamond from the table to the girdle.

Girdle: The point where the crown meets the pavilion.  This is the widest point of a diamond. 

Pavilion: The bottom part of a diamond from the girdle to the culet. 

Depth: The measurement of diamond from the center point of the table to the culet, which is the point on the bottom of a diamond.

Polish: The smoothness of a diamond's surface.

Symmetry: The exactness of a diamond's outline and the shape, placement and alignment of its facets.

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 will retract from how light refracts off a diamond which will reduce its brilliance.

Cut Grade: A grade that describes how well proportioned a round brilliant cut diamond is based on the following characteristics: 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 : Some diamonds a laser inscribed on the girdle to help identify a specific diamond.

Inclusion Plot Diagram with Key to Symbols: A plot of the location, type and size of inclusions in a diamond.