DIAMOND PROPORTIONS

 

THE IDEAL CUT

When a round, brilliant diamond has been cut to "Ideal" proportions by a master cutter, it has a splendor to behold.

The Ideal Cut Diamond describes a round brilliant diamond that has been cut to exact mathematically proven proportions. Its symmetry, with 58 exactly placed facets, produce the ultimate in lustre and beauty.

When a diamond is cut to ideal proportions, all of the light entering from any direction is totally reflected through the top and is dispersed into a display of sparking flashes and rainbow colours.

 

 

THE PREMIUM CUT

A Premium Cut diamond demonstrates subtle variations from the Ideal Cut. Although dimensional differences affect a diamond's reflection of light, a Premium Cut still achieve a harmonius balance between its proportions and the display of brilliance

 

Preferred Proportions for Round Diamonds

 

  Ideal Proportions Acceptable
Depth Percentage:  60.2% - 62.7% 57.0% - 64.0%
Table Percentage:  53% - 57.0% 53.0% - 64.0%
Polish: Very Good to excellent Good to Very Good
Symmetry: Very Good to excellent Good to Very Good
Girdle: Thin to medium Thin to Thick
Culet: None to very small None to medium

 

Preferred Proportions for Oval, Pear, Marquise, and Heart-Shaped Diamonds

 

Depth Percentage:  58.9% - 65.4%
Table Percentage:  53% - 64%
Polish: Good to excellent
Symmetry: Good to excellent
Girdle: Thin to thick

 

Preferred Proportions for Emerald and Radiant Cut Diamonds

 

Depth Percentage: 59.9% - 69.0%
Table Percentage: 59% - 69%
Polish: Good to excellent
Symmetry: Good to excellent
Girdle: Thin to thick

 

Preferred Proportions for Princess Cut Diamonds

 

Depth Percentage: 64.0% - 75.0%
Table Percentage: 59% - 72%
Polish: Good to excellent
Symmetry: Good to excellent
Girdle: Thin to thick

 

 

View approximate diamond carat girdle diameters displayed in millimetres.

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