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The Ideal Cut Diamond
The term ideal is a very strong adjective that usually describes something having reached a state of perfection or flawlessness. In our view, in order for a diamond to be described as an Ideal Cut, that diamond must exhibit the highest standards in proportion, external symmetry, external polish, optical reflective symmetry, light flow architecture, harmonization, aesthetics and light performance. This combination would undoubtedly produce the greatest degree of luster, brilliance, fire, scintillation, and aesthetics. In the world of diamonds, that means maximum beauty. Given our stringent definition of what an ideal round brilliant cut is, the traditional 58 facet round brilliant cut diamond does not meet this standard due to the inherent limitations of its faceting arrangement, even when cut perfectly. Nevertheless, in the pursuit of the traditional round brilliant cut, one should always seek out the most optimal proportions and finish in order to get the best appearance for this cut model.
Optimal Proportions for the Traditional Round Brilliant Cut Diamonds
Currently the optimal proportion tolerances required of Traditional Round Brilliant Cut Diamond are as follows. Table Percentage 52.4% to 57.5%, Depth Percentage 59.9% to 62.9%, Girdle Thickness Percentage .7 to 1.7%, crown angle 33.7-35.5%, Pavilion Angle Percentage 40.15-41.20%, Crown Height Percentage 14.2-17.2%, Pavilion Depth Percentage 42.2-43.8%. According to the American Gem Society, if a diamond is precisely measured within these tolerances, then the proportion is considered ideal. It is important to note that having the optimal proportions does not guarantee optimal light performance and aesthetics. The diamond must also have excellent reflective symmetry and finish in order to achieve excellent appearance for that cut model. It is very possible to purchase a so-called "Ideal Cut" diamond with optimal proportions that has poor light performance. (See the DSD Cut Quality Chart in the Selection Tools section for more details)
Proportions of a “traditional ideal cut” diamond
according to American Gem Society (AGS) |
Internal pattern of a “traditional ideal cut” diamond |
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