Which term indicates the measure derived by averaging the smallest and largest girdle diameters of a round brilliant?

Which term indicates the measure derived by averaging the smallest and largest girdle diameters of a round brilliant?

• A. Bast
• B. Average girdle diameter
• C. Alluvial deposit
• D. Adamantine luster

Answer: (B)

The measure derived by averaging the smallest and largest girdle diameters of a round brilliant is the average girdle diameter. This value provides a single, representative width for stones that may not be perfectly circular, by taking the shortest crosswise diameter and the longest crosswise diameter and averaging them. It helps describe overall size and enables consistent comparisons between stones, even when the girdle is slightly oval or irregular. The other terms don’t apply here: bast is a plant fiber, alluvial deposit is a geological sediment, and adamantine luster describes a type of brilliance, not a measurement.

The measure derived by averaging the smallest and largest girdle diameters of a round brilliant is the average girdle diameter. This value provides a single, representative width for stones that may not be perfectly circular, by taking the shortest crosswise diameter and the longest crosswise diameter and averaging them. It helps describe overall size and enables consistent comparisons between stones, even when the girdle is slightly oval or irregular. The other terms don’t apply here: bast is a plant fiber, alluvial deposit is a geological sediment, and adamantine luster describes a type of brilliance, not a measurement.