ROUND BRILLIANT DIAMONDS
The most popular of all cuts the Round Brilliant in its ideal proportions is
designed to give maximum scintillation, beauty and fire. Rounds make up the
vast majority of diamonds found in engagement rings and are popular as stud
earrings and in pendants. The Brilliant cut
follows more naturally the rough diamond crystal shape, and thus is most
popular for cutting due to the beauty it returns.
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The standard number of facets of a Round Brilliant Cut gemstone is 57, or
58 if the culet is included. On the Crown or upper part of the Diamond, these
consist of 1 table facet, 8 bezel facets, 8 star facets, and 16 upper girdle
facets for a total of 33. On the pavilion, or bottom part of the Diamond, there
are 16 lower girdle facets, 8 pavilion main facets and 1 culet, for a total of 25.
Round is from the Middle English word "Rounden", which means "Secret".
Although no single inventor has officially been credited with the invention of
the Round Brilliant Cut, many sources do credit a Venetian cutter named
Vincenzio Perruzzi and date the Brilliant's introduction to the 18th Century.
The Russian mathematical genius Marcel Tolkowsky, a member of a large and
powerful Diamond family, subsequently calculated the cuts necessary to create
the ideal Diamond shape. As part of his PhD thesis in mathematics, Tolkowsky
considered variables such as the index of refraction and covalent bond angles
to describe what has become known as the Round Brilliant Cut.
This cut is optically the most efficient. The Round Brilliant boasts one of the
best recoveries for well shaped rough Diamond; this translates into good value
for consumers.
The Round Brilliant Cut is designed to provide maximum optics for the brilliance
and scintillation, making the gem sparkle and dance in the light.
Since all independant laboratories certify the cut grade of Round Brilliant diamonds, we use this cut grade for you to search. Each lab has it's own method for determining the overal cut grade, but typically it will include a combination of depth, table, crown angle, pavilion angle, crown height, culet size, girdle thickness polish, symmetry and many other factors.
More information about Round Cut Diamonds on Wikipedia