A software summary for the text would be: The Round Cut Diamond is the most popular shape for engagement rings due to its cone shape that maximizes light return. The diamond has 58 facets with 33 on the crown and 25 on the pavilion.
This complementary relationship was honed over the last hundred years, when diamond cutter began using advanced theories of light behavior and mathematical calculations. It is because of these advances in diamond technology that diamond cutters were able to create the shape that would most make it seem as though light passing through it was dancing.
Brilliant cut diamonds should not be too shallow or too wide, as the light reflecting back through it will be lessened, and it will appear darker. According to Tolkowskys specifications, the cut height should be 59.3% of the diameter of the diamond, with about 43% for the pavilion and 16% for the crown.
Tolkowsky, a Russian mathematician, considered such advanced variables as index of refraction and covalent bond angles to describe what has simply become known as the Brilliant Cut. A lot of time, energy, and thinking went into creating the ideal diamond shape.
Some of the most famous Round Cut diamond engagement rings were given to women ranging from Angie Harmon to Barbra Streisand to Christina Aguilera. The Round or Brilliant Cut is considered the classic diamond shape for engagement rings.
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