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 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 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.
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.
The girdle is the outer edge of a diamond.
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.
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.
The diameter is the width of the stone across the girdle.
The depth is measured from the top of the table to the base of the pavilion and expressed by a percentage of the diameter.
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.
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.
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.
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.
The pavilion depth is the depth from the Girdle to the culet (bottom of diamond). This is expressedin a percentage of the diameter.
The crown facets are the 33 facets which make up the top portion of a diamond (above the girdle).
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.
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.
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