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The diamonds below have 32-33 and 41.2 proportions and will look similar to a 34-35, 40.6-41. 34-35 and 40.6-41 are good proportions, but they are too restrictive. It's hard to explain this relationship between crown and pavilion angle using simple numerical guidelines, which is why no one does it.
In general the following proportions will provide the best light return. For round brilliant cut, as you get closer to the "ideal" there will be more fire and brilliance: Table: 57 to 58%->ideal 58 Depth: 61 to 62.5% ->ideal 62 Crown angle: 34 to 35-> ideal 35 Pavillion angle: 40.6 to 41 ->ideal 41
I recommend diamonds with proportions that sit in the intersection of GIA EX/AGS 0 Ideal and show nice optical symmetry. That's what's shown in my cut estimator with visual examples of each proportion combination.
When buying diamonds, the ideal proportions matter and precision is required. Even if a diamond has just a 0.2° deviation in pavilion angles (41.2°), it WILL impact light performance. It doesn’t matter whether it has been graded as a triple excellent diamond or a triple ideal stone.
18 Δεκ 2023 · Crown angle: Angle of the crown from top of the girdle to edge of a diamond crown; Ideal Cut Diamond Proportions. The best diamond proportions allow light to refract and reflect back to your eyes. The ideal round diamond proportions are listed in the table below and based on expert recommendations.
Tolkowsky’s Ideal Cut Specifications. The Tolkowsky formula is concerned with round brilliant diamonds (although the term round brilliant arrived after his ideal cut theory was printed). He suggested that the ideal cutting proportions that would yield the best light return are as follows:
More importantly, ideal round cut diamonds provide a maximum light return compared to other shapes. The proportions of a well-cut round with its 57 facets allow for nearly 100 % light return. You can see it quite easily if you compare the ASET images of perfect round and princess cut diamonds.
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