Round Brilliant Cut Diamonds

18 Aug 2010

The round brilliant cut is by far the most popular diamond cut for engagement rings and most other types of jewellery.  This type of cut accounts for around 75% of all diamonds sold.

Known for its superior sparkle, the round brilliant cut is generally regarded as the most optically spectacular of all cuts.  Today's brilliant cut is comprised of 58 facets.  The cut was developed over time with the first prototype having been traced back to the beginning of the 15th century.  The term "brilliant cut" was not a normally used term for some time with the first recorded use dating back to 1614.

In 1919, Marcel Tolkowsky, a mathematician from Antwerp, analysed the proportions of the brilliant cut and came up with a mathematical formula for how to cut a round brilliant cut in a way that would maximise the brilliance (the amount of light reflected) and fire (flashes of spectral colour).  Different versions of this style became known as the Tolkolsky Cut and the Modern Brilliant Cut.

Click here to read more about different diamond shapes or to view a range of round diamond engagement rings.

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