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The round brilliant cut diamond is by far the most popular and most researched diamond shape available today. For almost 100 years, diamond cutters have been using advanced theories of light behavior and precise mathematical calculations to optimize the brilliance in a round diamond. In addition to being the most popular and researched shape, a round diamond will typically give you more flexibility in terms of balancing cut, color, and clarity grades while still getting the
fire and brilliance you want. 
The typical brilliant cut diamond is cut with 58 facets, 33 on the crown and 25 on the pavilion. On a well-proportioned stone, these facets will be uniform and symmetrical. If they are not, the diamond's ability to retract and reflect light will suffer.
Depth percentage is the depth of the diamond (table to culet) divided by the width of the diamond. The higher the depth percentage, the deeper the stone looks in appearance. The lower the depth percentage the shallower the stone looks. For example, a diamond with depth of 4.09 mm and width (average diameter) of 6.75 mm equals a depth percentage of 60.6%. For a round diamond, a good target for the depth percentage is 59-62.5%.

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