The round brilliant diamond cut is the most popular diamond shape today. It accounts for more than 50% of all diamonds sold today. It was initially developed in Europe, however the round brilliant is sometimes referred to as the American Ideal Cut.
It has 58 facets divided among its crown, girdle and pavilion and exhibits a typical ratio between 1.00 and 1.02. It yields maximum shine since the cut naturally follows the rough diamond crystal.
The round brilliant cut is the most researched diamond cut in the industry. Diamond cutters have used advanced scientific theories of light reflection and precise mathematical calculations to optimize its fire and brilliance, for over a century.
The round brilliant cut’s origins can be traced back to the middle of the 17th century when diamond cutters began using more refined and complicated ways of cutting diamonds. Early brilliant cuts were actually known as Mazarins, after their designer Cardinal Mazarin, who made the first cross-cut diamond way back in 1650.
A series of gradual transformations and developments over the course of the 18th century meant that the Mazarins gave birth to the Portuguese Peruzzi, “old mine,” or “old European cut” in the 1700s.
In 1919 the early modern round brilliant was created, although it was initially referred to as the Tolkowsky cut after its creator, Russian mathematician and diamond enthusiast Marcel Tolkowsky.