Which term is the distance from the girdle plane to the culet expressed as a percentage of average girdle diameter?

Which term is the distance from the girdle plane to the culet expressed as a percentage of average girdle diameter?

• A. Pavilion angle
• B. Pattern
• C. Pavilion bulge
• D. Pavilion depth percentage

Answer: (D)

In diamond proportions, many measurements are described as percentages of the girdle diameter so values translate across different sizes. The distance from the girdle plane to the culet is the depth of the pavilion. When this distance is expressed as a percentage of the average girdle diameter, you get the pavilion depth percentage. This term specifically captures how deep the pavilion sits in relation to the stone’s overall width, which is essential for assessing cut balance and light performance. The other terms refer to different aspects: the pavilion angle is an angular measure, not a percentage; pattern concerns facet alignment, and pavilion bulge describes a curvature feature rather than a standardized depth percentage. That makes pavilion depth percentage the correct descriptor for this measurement.

In diamond proportions, many measurements are described as percentages of the girdle diameter so values translate across different sizes. The distance from the girdle plane to the culet is the depth of the pavilion. When this distance is expressed as a percentage of the average girdle diameter, you get the pavilion depth percentage. This term specifically captures how deep the pavilion sits in relation to the stone’s overall width, which is essential for assessing cut balance and light performance. The other terms refer to different aspects: the pavilion angle is an angular measure, not a percentage; pattern concerns facet alignment, and pavilion bulge describes a curvature feature rather than a standardized depth percentage. That makes pavilion depth percentage the correct descriptor for this measurement.