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Marcel Tolkowsky (25 December 1899 – 10 February 1991), [1] an engineer by education, was a Belgian member of a Jewish family of diamond cutters from Poland.He is generally acknowledged as the father of the modern round brilliant diamond cut. [2]
HCA: defining ideal cut diamonds is a detailed explanation of the "Holloway Cut Adviser". A web service that uses this software is available. Malecka, Anna (2017). Naming of the Koh-i-Noor and the Origin of Mughal-Cut Diamonds, The Journal of Gemmology, no. 4. 38(8). OctoNus Software has posted several diamond cut studies, by various authors ...
Āina-kāri in the main hall of Emarat-e Badgir in Golestan Palace. Āina-kāri [1] (Persian: آینهکاری) is a kind of Persian interior decoration where artists assemble finely cut mirrors together in geometric, Its origin and invention is from Persians. lligraphic or foliage forms (inspired by flowers and other plants). [2]
An orthogonal mirror construction [∞,2,∞] also exists, seen as two sets of parallel mirrors making a rectangular fundamental domain. If the domain is square, this symmetry can be doubled by a diagonal mirror into the [4,4] family. Families: (4,4,2), ~, [4,4] – Symmetry of the regular square tiling
Between 1991 and 1994 Pauline Willemse, a diamond polisher at Royal Coster Diamonds, polished the smallest diamond in the world. This is a brilliant cut stone with 57 facets, weighing 0.0000743 carats (0.01486 mg). 0.16–0.17 mm in diameter and with a height of 0.11 mm.
(A poorly cut 1.0-carat (200 mg) diamond may have the same diameter and appear as large as a 0.85-carat (170 mg) diamond.) The depth percentage is the overall quickest indication of the quality of the cut of a round brilliant. "Ideal" round brilliant diamonds should not have a depth percentage greater than 62.5%.