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Sparkly Spotlight on... Round Brilliant Diamonds

Sparkly Spotlight on...  Round Brilliant Diamonds

Not all round diamonds are Round Brilliant diamonds. A brilliant cut is defined as one resembling two pyramids placed base to base.

Undoubtedly one of the most popular shapes of diamond, the Brilliant Round is often the diamond of choice for an engagement ring. But did you know that beneath the romance beats a heart of science? Advanced theories of light behaviour and precise mathematical calculations are employed to optimise the diamond’s sparkle.


In 1919 the original Round Brilliant cut was first developed by Marcel Tolkowsky. He identified the relationship between the depth of the diamond and the quality of sparkle produced, and went on to develop a mathematical formula for cutting and angling facets. If a diamond was cut too deep or too shallow light would escape out its sides or bottom reducing the fire (coloured light from within a diamond) and brilliance (white light reflected up through the top).  It is Fire and Brilliance that give a Brilliant Round diamond its “sparkle”.

Tolkowsky’s theory has been further advanced by computer models and scopes, but still serves as the basis for brilliant cut diamond standard.


Technical Specifications

  • The Round Brilliant diamond shape has 57 facets comprising 33 facets on the crown and 25 on the pavilion.
  • The crown facets comprise the table, 8 star facets, 8 kite facets, and 16 upper girdle facets.
  • The pavilion facets comprise 16 lower girdle facets and 8 pavilion main facets. There may also be a culet.
  • For a diamond that’s a perfect circle, look for a stone with a ratio of as close to 1.00 as possible.

As a popular shape the Brilliant Round Diamonds presents many setting options. In addition to stunning engagement rings, Brilliant Round diamonds make wonderfully simple diamond stud earrings, and can rarely be beaten for a simple yet elegant pendant.

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