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  1. 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.

  2. 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.

  3. 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. It also discusses how to use Facetware online to obtain a more accurate estimate of a cut grade. Full-color, 8 page booklet.

  4. 19 Ιουλ 2021 · Diamond Proportions: Modern Round Brilliant Cuts. The physics of light-behavior within a diamond are reliably consistent, which means proportions measurements can be used to draw certain conclusions about a diamond’s likely appearance.

  5. 4 Απρ 2023 · Round Super Ideal Cut Proportions. Crown angle and pavilion depth play a significant role in picking a super ideal cut diamond from an ideal cut diamond. These two factors can help distinguish two round cut diamonds with equally excellent cut, symmetry, and polish grades from GIA.

  6. 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

  7. 25 Σεπ 2022 · An ideal cut diamond refers to a diamond that has been cut and faceted by diamond cutters to exact measurements and symmetry to achieve superior light performance. It is the best cut grade available on a diamond grading report or diamond certificate.