ADVANCED DIAMOND CRITERIA
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Advanced Diamond Criteria

How well a diamond is polished is referred to as the 'make' of a diamond.

 

These advanced criteria will give you an understanding of the small variations of a diamond's make that affect the brilliance and sparkle.

Polish

Polish is a measure of how smooth and clean the facets of a diamond are. If the Polish of the stone is rough or wavy, it keeps light from passing through the facets and being reflected, thus effecting the diamond's fire and brilliance.

Symmetry

Symmetry is a measure of how perfectly mirrored and balanced the diamond facets are. A symmetrical diamond will allow the facets to reflect the most amount of light possible giving the diamond fire and brilliance.

Fluorescence

Under most conditions, fluorescence is not detectable to the eye. This is an effect that is seen in some gem-quality diamonds when they are exposed to ultraviolet light.

diameter
 

 

Girdle

The girdle is the outer edge of a diamond.

Table

The table is the flat facet at the very top of a diamond. It is has eight sides and is the window into the heart of a diamond.

Culet

The culet is the extremely small facet at the bottom of a diamond. The Culet is parallel to the table and is to protect the vulnerable tip of the Diamond from Chipping.

There are 8 different types of culet descriptions: none, very small, small, medium, slightly large, large, large culet and extremely large.

Diameter

The diameter is the width of the stone across the girdle.

Depth

The depth is measured from the top of the table to the base of the pavilion and expressed by a percentage of the diameter.

Table Size

The table size is the average of four measurements from each side of the table. The table size is expressed in a percentage of the diameter.

Crown Angle

The crown angle is the angle or slope at which the top part of the diamond increases and is measured in degrees from the girdle.

Crown Height

The crown height is the height of the crown. It is measured from the girdle to the top of the table and is expressed in a percentage of the diameter.

Pavilion Angle

The pavilion angle is the angle or slope of the base (below the girdle) of the diamond. It is measured in degrees from the girdle.

Pavilion Depth

The pavilion depth is the depth from the Girdle to the culet (bottom of diamond). This is expressedin a percentage of the diameter.

Crown Facets

The crown facets are the 33 facets which make up the top portion of a diamond (above the girdle).

Star Length

The star length is the length of the star facets relative to the table length. It is expressed by a percentage of the length of the table.

Pavilion Facets

These are the 25 facets that form the bottom (or base) of the diamond below the girdle.

Lower-Half Facet Length

The lower-half facet length is expressed in a percentage of the length from the girdle to the culet.

When you are ready to find the perfect diamond, search through over 75,000 diamonds here.

 


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