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Diamond proportions and facets, for the round brilliant cut. The modern round brilliant-cut was developed by Marcel Tolkowsky in 1919. The ideal proportions are 100% diameter, 53% table, 43.1% pavilion and 16.2% crown. The girdle and culet (if any—not part of
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 ...
A large carat weight may not necessarily equate to the overall best-looking diamond. “A smaller, well-cut diamond with excellent color and clarity may appear more stunning than a larger, lower ...
Several different theories on the "ideal" proportions of a diamond have been and continue to be advocated by various owners of patents on machines to view how well a diamond is cut. These advocate a shift away from grading cut by the use of various angles and proportions toward measuring the performance of a cut stone.
An example of this is the marquise cut diamond which was popular in the 1970s to 1980s. In later decades, jewelers had little success in selling this shape in comparison to other shapes like the oval or pear shape. [citation needed] The marquise can be cut into an oval diamond by any diamond cutter with a loss of 5 to 10% in total weight.
The diamond cut planning stage is a complex process that requires the cutter to work with unique rough stones. Very often, the location of the inclusions in a rough stone will determine the type of shape to which a diamond may be cut. For economic reasons, most diamonds are cut to retain weight instead of maximizing brilliance. [2]
LKI's main business activity is cutting and polishing "ideal-cut" and "fine make" diamonds, which it sells to upscale retail jewelers throughout the world. Some of these diamonds are distributed loose while others are set in jewelry under the Lazare Diamond brand. LKI distributes its products through over 1,500 retail partners and customers in ...
Cutting and polishing diamonds in the Netherlands, 1946. The art of cutting a gem is an exacting procedure performed on a faceting machine.The ideal product of facet cutting is a gemstone that displays a pleasing balance of internal reflections of light known as brilliance, strong and colorful dispersion which is commonly referred to as "fire", and brightly colored flashes of reflected light ...
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