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Tolkowsky Round Brilliant Cut Design

Tolkowsky’s Ideal Cut

In 1919 a young mathematician, Marcel Tolkowsky, developed the optimal proportions for round brilliant cut diamonds. Tolkowsky provided several sets of proportion measurements for what he believed to be the best-looking cut. This is the basis for the traditional model of what many in the industry call the "Ideal Cut” (Crown 34.5°, Pavilion 40.75° and Table 53% is one of five sets that's very popular and is currently considered "Ideal" by the American Gem Society.) However, even Tolkowsky understood that his measurements were just one opinion in a range of proportions for beautiful diamonds, and that a diamond's beauty was unique to each viewer. Thus, the beauty of a diamond is governed by scientific principles, but only an experienced diamond cutter can bring out the best in a diamond with his artistic abilities.

Tolkowsky’s Measurements Still Used Today

Mr. Tolkowsky provided specific mathematical tolerances for the crown angle, pavilion depth and table size of his ideal cut diamond. Even though Mr. Tolkowsky's analysis of the baroque brilliant diamond was empirical in nature and based on a two dimensional model with no emphasis on girdle thickness, amazingly, Mr. Tolkowsky's measurements are still today regarded by many in the diamond world as the standard for ideal proportions for a round brilliant cut.

History Behind the Traditional Round Brilliant Cut
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