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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.
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.
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.
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.
Explains the system, gives definitions, and displays the proportions listed on a GIA Diamond Grading report. It shows twenty-five example images of round brilliants — five in each of the five grade categories — and gives their proportion combination, values for additional parameters, and a short caption about why that diamond belongs in ...
estimating a GIA Cut Grade for round brilliant diamonds with crown angles between 22.0 and 40.0 degrees, pavilion angles between 38.8 and 43.0 degrees, and table sizes
These are diamonds with near misses in proportions and I want you to look at how a small variation can affect the light return of the diamond in a big way. The ASET imagery reveals significant light leakage and poor edge-to-edge brightness for both diamonds.
