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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
Aside from girdle thickness (very thin can be prone to chipping, while thick to very thick can mess with light ray paths), the crown height and pavilion depth aren't as critical, but I recommend the following for ideal to super ideal proportions: CH: 15-15.5% ideally, but 14.5-16% acceptable.
Beyond4Cs.com’s Ideal Cut Proportions for Round Diamonds. Now, with all the technical specifications laid out, you might assume that all the diamonds in the market should be polished to ideal proportions if cutters simply followed a standard formula. However, the truth is far from that.
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.
Example: Consider a round brilliant diamond with these proportions: table 56%, crown angle 36.5°, pavilion angle 41.2°, star length 55%, lower half 80%, medium girdle, no culet, Very Good polish and symmetry, and girdle thickness 3.0%.
GIA Cut Grade Estimation Tables for Standard Round Brilliant Cut Diamond Explains how to locate a particular proportion combination, and determine whether it is close to a boundary in the cut grading system.
