Which term describes the length of the lower girdle facets expressed as a percentage of the distance between the girdle and the culet?

Which term describes the length of the lower girdle facets expressed as a percentage of the distance between the girdle and the culet?

• A. The height of the girdle facets
• B. The distance from girdle to culet
• C. The proportion of girdle thickness to diameter
• D. Lower girdle facet percentage

Answer: (D)

The length of the lower girdle facets expressed as a percentage of the distance from girdle to culet is described by the lower girdle facet percentage. This term measures how long those pavilion facets are relative to the total height from girdle to culet, and expresses it as a percent. It matters because it helps define how the pavilion angles and facet junctions interact to influence light performance and symmetry in the diamond’s lower half. It is different from girdle height (which is the girdle’s thickness as a percent of diameter), from the actual distance from girdle to culet (a raw measurement, not a percentage), and from the general girdle-thickness-to-diameter proportion (which concerns girdle thickness, not the length of the lower girdle facets).

The length of the lower girdle facets expressed as a percentage of the distance from girdle to culet is described by the lower girdle facet percentage. This term measures how long those pavilion facets are relative to the total height from girdle to culet, and expresses it as a percent. It matters because it helps define how the pavilion angles and facet junctions interact to influence light performance and symmetry in the diamond’s lower half. It is different from girdle height (which is the girdle’s thickness as a percent of diameter), from the actual distance from girdle to culet (a raw measurement, not a percentage), and from the general girdle-thickness-to-diameter proportion (which concerns girdle thickness, not the length of the lower girdle facets).