What is the estimated girdle thickness percentage for a stone with the following proportions: total depth percentage: 62.8 percent, crown height percentage: 15.5 percent, pavilion depth percentage: 45.5 percent?
The estimated girdle thickness percentage for the given stone is 1.8 percent.
Understanding Girdle Thickness Percentage Calculation
Girdle Thickness Percentage Calculation: To calculate the estimated girdle thickness percentage for a stone, we need to consider the total depth percentage, crown height percentage, and pavilion depth percentage.
The girdle thickness percentage is determined by subtracting the sum of the crown height percentage and pavilion depth percentage from the total depth percentage. Here's how it's calculated step by step:
1. Add the Crown Height and Pavilion Depth Percentages: Add 15.5 percent (crown height) and 45.5 percent (pavilion depth) to get 61 percent.
2. Calculate Girdle Thickness Percentage: Subtract 61 percent from the total depth percentage of 62.8 percent to find the girdle thickness percentage, which is 1.8 percent.
The crown height percentage represents the distance from the table facet to the girdle, while the pavilion depth percentage represents the distance from the culet to the girdle. The girdle thickness percentage accounts for the remaining portion of the total depth percentage that is not covered by the crown height and pavilion depth percentages.
Understanding the girdle thickness percentage is crucial in evaluating the proportions and quality of a stone's cut. It affects the stone's appearance, brilliance, and overall value in the gemstone market.