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- Marcel_Tolkowsky abstract "Marcel Tolkowsky (December 25, 1899 – February 10, 1991) was a member of a Polish family of diamond cutters and an engineer by education. He is generally acknowledged as the father of the modern round brilliant diamond cut. Many of his family have gone on to become noted diamond cutters, including his cousin Lazare Kaplan and his great nephew Gabi Tolkowsky.In 1919, as part of his PhD thesis, he published the specifications of the American Standard (also known as the American Ideal Cut, Tolkowsky cut, and Tolkowsky Brilliant), which is the diamond-cutting benchmark in North America. It was derived from mathematical calculations that considered both brilliance and fire of the stone. Marcel Tolkowsky found that if a diamond was cut too deep or shallow then light would escape out the sides or bottom of the diamond resulting in a loss of brilliance (white light reflected up through the top of a diamond), fire (colored light reflected from within a diamond), and sparkle (combination of fire and brilliance). The design was published in 1919 by Tolkowsky in his book Diamond Design. The original model was intended to be a set of general guidelines; several aspects of a diamond's cut had not been accounted for or explored. Later modifications of round brilliants differ in minor ways.".
- Marcel_Tolkowsky birthDate "1899-12-25".
- Marcel_Tolkowsky birthYear "1899".
- Marcel_Tolkowsky deathDate "1991-02-10".
- Marcel_Tolkowsky deathYear "1991".
- Marcel_Tolkowsky wikiPageExternalLink diamond.
- Marcel_Tolkowsky wikiPageExternalLink www.tolkowsky.com.
- Marcel_Tolkowsky wikiPageID "2168250".
- Marcel_Tolkowsky wikiPageRevisionID "604014048".
- Marcel_Tolkowsky dateOfBirth "1899-12-25".
- Marcel_Tolkowsky dateOfDeath "1991-02-10".
- Marcel_Tolkowsky hasPhotoCollection Marcel_Tolkowsky.
- Marcel_Tolkowsky name "Tolkowsky, Marcel".
- Marcel_Tolkowsky placeOfBirth "Antwerp".
- Marcel_Tolkowsky placeOfDeath "New York City, New York, USA".
- Marcel_Tolkowsky shortDescription "Diamond cutter".
- Marcel_Tolkowsky description "Diamond cutter".
- Marcel_Tolkowsky description "Diamond cutter".
- Marcel_Tolkowsky subject Category:1899_births.
- Marcel_Tolkowsky subject Category:1991_deaths.
- Marcel_Tolkowsky subject Category:Belgian_Jews.
- Marcel_Tolkowsky subject Category:Belgian_engineers.
- Marcel_Tolkowsky subject Category:Diamond_cutting.
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- Marcel_Tolkowsky comment "Marcel Tolkowsky (December 25, 1899 – February 10, 1991) was a member of a Polish family of diamond cutters and an engineer by education. He is generally acknowledged as the father of the modern round brilliant diamond cut.".
- Marcel_Tolkowsky label "Marcel Tolkowsky".
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- Marcel_Tolkowsky givenName "Marcel".
- Marcel_Tolkowsky homepage www.tolkowsky.com.
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- Marcel_Tolkowsky name "Marcel Tolkowsky".
- Marcel_Tolkowsky name "Tolkowsky, Marcel".
- Marcel_Tolkowsky surname "Tolkowsky".