Measurements

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

Carat Weight

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

Color Grade

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

Clarity Grade

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.

Cut Grade

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

Depth

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

Table

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

Crown Angle

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

Crown Height

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.

Pavilion Angle

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

Pavilion Depth

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

Star Length

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

Lower Half

Girdle

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

Culet

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

Polish

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

Symmetry

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

Fluorescence

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.

Clarity Characteristics

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

Cloud

Crystal

Knot

Pinpoint

Indented Natural