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Encyclopedia > Marcel Tolkowsky
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Marcel Tolkowsky (1899-1991) was a member of a Belgian family of diamond cutters and an engineer by education. He is generally acknowledged as the father of the modern round brilliant diamond cut. Developed by Marcel Tolkowsky in 1919, the American Standard (also known as the American Ideal Cut, Tolkowsky cut, and Tolkowsky Brilliant) is the benchmark in North America. It was derived from mathematical calculations that considered both brilliance and fire of diamonds. Later modifications of round brilliants differ insignificantly. Jump to: navigation, search A scattering of round-brilliant cut diamonds shows off the many reflecting facets. ... Jump to: navigation, search This article addresses the many styles of diamond cut. ... Jump to: navigation, search 1919 was a common year starting on Wednesday (see link for calendar). ... Jump to: navigation, search World map showing North America A satellite composite image of North America North America is a continent in the northern hemisphere, bordered on the north by the Arctic Ocean, on the east by the North Atlantic Ocean, on the south by the Caribbean Sea, and on... Diamonds () is one of the four suits found in playing cards. ...


The design was published in 1919 by Tolkowsky in his book Diamond Design, the first publication about proportions of diamond cutting. It was based on his Master's thesis on the subject.


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GIA: Research: Article Detail (0 words)
Marcel Tolkowsky (figure 1) was born in Antwerp in 1899, on the eve of the twentieth century.
Marcel Tolkowsky was born into a leading family of diamond cutters, cleavers, and dealers, and was related to another important family in the world of diamonds, that of Lazare Kaplan [Footnote 2].
Marcel Tolkowsky was not the first to study diamond cuts or to attempt to systematically study different diamond proportions.
Marcel Tolkowsky - Encyclopedia, History, Geography and Biography (390 words)
Marcel Tolkowsky (1899-1991) was a member of a Belgian family of diamond cutters and an engineer by education.
Developed by Marcel Tolkowsky in 1919, the American Standard (also known as the American Ideal Cut, Tolkowsky cut, and Tolkowsky Brilliant) is the benchmark in North America.
Another important point to consider is that Tolkowsky did not follow the path of a ray that was reflected more than twice in the diamond.
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