This is by far the most popular diamond shape and also the most optically brilliant, because of its 360-degree symmetry. The ‘ideal’ round brilliant cut was calculated by gem enthusiast and mathematician Marcel Tolkowsky in 1919, to reflect and scatter the maximum amount of light. The round silhouette works with almost every mounting, from classic solitaires to the most avant-garde designs. Round diamonds can be set in prongs, in which they are visible from all sides, or into bezel mountings. In general, well cut round diamonds should be set with the least possible amount of metal around the stone, so that it is held securely but can still have light entering it to show off its sparkle and brilliance.
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