Diamond dimensions listed as “minimum diameter – maximum diameter x depth” for round diamonds and “length x width x depth” for fancy-shaped diamonds. 

Weight given in carats, recorded to the nearest hundredth of a carat. One carat is equal to 1/5 of a gram.

The absence of color ranging from colorless to light yellow or brown when compared to GIA Master Color Comparison Diamonds.

The relative absence of inclusions and blemishes. Graded on a scale from Flawless to Included based on size, nature, number, position, and relief of characteristics visible under 10x magnification.

For standard, D-to-Z color, round brilliant diamonds. Cut grade incorporates the aspects of face-up appearance, design, and craftsmanship.

Table-to-culet depth, expressed as a percentage of average girdle diameter for round shapes or width for fancy shapes.

Table size expressed as a percentage of a round brilliant’s average girdle diameter for round shapes or width for fancy shapes.

The average of the angles of the bezel facet planes relative to the table planes.

Measurement from the table plane to the intersection of the bezel facet with the girdle. The Crown Height % is the average crown height relative to the average diameter for round shapes and width for fancy shapes.

Average of the angles formed by the pavilion main facet planes and the girdle plane.

Measured from the girdle to the culet, then expressed as a percentage of average girdle diameter for round shapes or width for fancy shapes.

Length of star facets expressed as a percentage of the total distance between the girdle and the edge of the table facet.

Thickness of the intersection of the crown and pavilion which defines the perimeter of the diamond.

Size of the facet at the tip of a gemstone relative to the average diameter for round shapes or width for fancy shapes.

Smoothness of the diamond’s surface, assessed on a scale ranging from excellent to poor.

Exactness of the diamond’s outline, and the shape, placement, and alignment of its facets, assessed on a scale ranging from excellent to poor.

Strength and color of the diamond when viewed under long-wave ultraviolet light. A fluorescence description of “none” represents a range of fluorescence from indiscernible to very faint. Used for identification purposes.

List of the most significant clarity characteristics present in the diamond that justifies the clarity grade; a maximum of four characteristics are listed.