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

• A. Table Percentage
• B. Crown Height Percentage
• C. Average Girth Diameter
• D. Girdle Thickness

Answer: (B)

Crown height percentage describes how tall the crown portion of the diamond is relative to its width. The distance from the girdle plane up to the table is the crown height, and when you express that height as a percentage of the average girdle diameter, you obtain the crown height percentage. This proportion is a standard way to express the vertical dimension of the crown in round brilliant cuts and helps gauge how the geometry will influence light return and overall brilliance.

The other terms don’t describe this specific vertical-to-horizontal relationship: table percentage uses the table width in relation to the overall diameter, girdle thickness refers to the thin or thick edge around the stone, and average girdle diameter isn’t the ratio being described here.