American Cut - Those proportions and facet angles calculated mathematically by Marcel Tolkowsky to produce maximum brilliancy consistent with a high degree of fire in a round diamond brilliant are considered by many diamond men to constitute the ...
American cut: See Ideal cut.
Amethyst: A transparent, pale-violet to deep-purple variety of crystalline quartz. Major sources: Siberia, Brazil, Uruguay. It is the February birthstone.
American Cut
Marcel Tolkowsky's mathematically calculated ideal proportions and facet angles, to produce maximum brilliancy consistent with a high degree of fire in a round diamond brilliant, are known as American Cut or Ideal Cut.
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AMERICAN CUT - First designed by Marcel Tolkowsky, this type of cut is also called an Ideal cut. Tolkowsky used mathematics to calculate the proper proportion to increase a diamond's brilliancy (fire) when cut in a round shape.
Although a wide variety of cuts have and continue to be used to facet diamond, by far the standard in this country is the Standard Brilliant or American Cut. Next in popularity are the Marquises and Pear-shapes.
It may refer to a diameter less than the American cut 53% (of the girdle diameter) or, more frequently, to a table smaller than about 60%, because so many of the stones cut today have tables well over that figure.
This produced first diamond with a truly round outline and good optical proportions and the "American cut"was born. Morse's work with diamond proportions was later popularized by Marcel Tolkowsky leading to the so called "ideal-cut" diamond.
 See also: Gemstone, Gem, Finish, Crown, Ring
  
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