The round‐cut diamond is the most popular shape, accounting for 75% of all diamonds sold. This shape’s popularity is attributed to the way it is cut, which, moreso than other shapes, allows it to beautifully reflect light.

Rounds typically cost 25%‐35% more than fancy shapes because demand is high and yield is low. When compared to other shapes, more of the rough stone is lost in the cutting of a round diamond, raising the cost of each carat retained.

Most round diamonds are “brilliant‐cut”, containing 57 facets, or 58 if there is a culet.

Marcel Tolkowsky’s 1919 publication: “Diamond Design: A Study of the Reflection and Refraction of Light in Diamond," described the ideal proportions of a round cut in order to maximize light return and dispersion. The original Tolkowsky specifications are as follows: 53% table, 59.3% depth, 34.50 crown angle, visible culet. Due to theoretical and technological advancements, these parameters have since been perfected.

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