The diamond crown height percentage refers to the ratio of the height of the crown (the top portion of the diamond) relative to the total depth of the diamond. This percentage is a key factor in evaluating the cut quality of a diamond and has a direct impact on how well the diamond reflects light, which in turn affects its brilliance and fire.
Ideal Crown Height Percentage:
For a round brilliant cut diamond, the ideal crown height typically falls between 12% and 16% of the total depth of the diamond.
12% to 16% is considered the sweet spot because this range ensures that the crown is appropriately proportioned to maximize light return and optimize brilliance.
How to Calculate Crown Height Percentage:
The crown height percentage is calculated by dividing the height of the crown by the total depth of the diamond, then multiplying the result by 100.
Crown Height Percentage=(Total DepthCrown Height)×100
Impact of Crown Height Percentage on Diamond Appearance:
Too Shallow: A crown height percentage that is too low (e.g., below 12%) can result in a diamond that looks flat and lacks brilliance. This is because light may escape through the sides of the diamond, reducing its sparkle.
Too Tall: A crown height percentage that is too high (e.g., above 16%) may make the diamond look overly deep or top-heavy, potentially reducing its overall brightness as light leaks out of the bottom, rather than returning through the table.
Ideal Proportion: Diamonds with a crown height percentage within the 12%-16% range tend to have the optimal balance of light reflection, maximizing both brilliance and fire. These diamonds typically appear vibrant and well-proportioned.
Crown Height and Other Proportions:
While crown height is crucial, it should not be considered in isolation. It works in conjunction with other cut proportions, such as:
Pavilion angle (the angle of the lower portion of the diamond)
Table size (the flat surface on top of the diamond)
Girdle thickness (the outermost edge of the diamond)
For the best light performance, all these proportions need to complement each other. A well-proportioned crown height enhances the overall cut quality and brilliance of the diamond, contributing to its desirability and value.
Summary:
Crown Height Percentage: The ratio of the crown height to the total depth of the diamond.
Ideal Range: The ideal crown height percentage for a round brilliant diamond is typically between 12% and 16%.
Impact on Brilliance: An ideal crown height percentage ensures maximum light return, producing a diamond with optimal sparkle and brilliance.