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Categorization of diamonds on the basis of rating score -by Brian Gavin.


The size of the table facet; expressed as a percentage of the average girdle diameter.

Table %

The number to identify this product.


Table to culet depth; expressed as a percentage of the average girdle diameter.

Depth %

Face-up shape of a polished diamond - the girdle outline.


The distance from the top of the girdle plane to the table; expressed as a percentage of the average girdle diameter.

Crown %

Name of the Lab where the report was issued.


The average angle formed by the bezel facets and the girdle plane.

Crown Angle

The weight of a diamond is measured in carats. Carat is the international unit of measurement for gem weight. One Carat equals one fifth of a gram.


Average length of the star facets; expressed as a percentage of total distance between table edge and girdle edge.

Star %:

D to Z scale is the standard for color grading diamonds, from colorless to light yellow and light brown. Each letter represents a range of color based on a diamond\'s tone – darkness or lightness – and saturation – intensity.


The angle formed by the pavilion main facets and the girdle plane.

Pav Angle:

Clarity characteristics include blemishes and inclusions. Blemishes are limited to the diamond’s surface. Inclusions can extend from the surface into the diamond’s interior or may be completely enclosed within the diamond.


The distance from the bottom of the girdle plane to the culet; expressed as a percentage of the average girdle diameter.

Pavillion %

The length, width and depth of the diamond expressed in mm.

0.00 x 0.00 x 0.00

Average length of the lower girdle facets; expressed as a percentage of total distance between girdle edge and culet.

Lower Girdle %

The cut grade earned at the grading laboratory.<br /><br />AGS: Diamond-specific evaluation based on scientific ray-tracing<br /><br />GIA: Predictive grade based on past human observation

Lab Cut Grade

The bottommost point of the diamond, which can be completely pointed or end in a flat facet.


AGSL proprietary grade - based on:<br />
Brightness: All light that returned to the eye<br /><br />Dispersion: The suite of dispersed colored flashes; also known as fire<br /><br />Contrast: The dynamic pattern of dark and light areas<br /><br />Scintillation: Sparkle seen as the diamond, observer or light source moves

Light Performance

Around 1/3 of diamonds fluoresce when exposed to UV light. This is an expression of the strength of the diamond’s fluorescence.


The overall condition of the facet surfaces of a finished diamond.


The minimum and maximum thickness measurements around the girdle; expressed as a percentage of average girdle diameter (GIA measures at valleys only).


The shaping and alignment of the diamond\'s finished facets.


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