Lower girdle facet percentage is

Lower girdle facet percentage is

• A. The height of the crown above girdle
• B. The width of the lower girdle facets
• C. The angle of the lower girdle facets
• D. The length of the lower girdle facets expressed as a percentage of the distance between the girdle and the culet.

Answer: (D)

The key idea is that the lower girdle facet percentage describes how long the lower girdle facets are in relation to the vertical height from the girdle to the culet. In other words, it’s the length of those facets expressed as a percentage of the distance from girdle to culet, which defines how much of the pavilion is taken up by the lower girdle facets. This matters because it influences the pavilion geometry and how light is guided through the lower part of the diamond. The other options describe different dimensions—crown height, the width of the facets, or the facet angle—none of which capture the percentage of the vertical distance spanned by the lower girdle facets.

The key idea is that the lower girdle facet percentage describes how long the lower girdle facets are in relation to the vertical height from the girdle to the culet. In other words, it’s the length of those facets expressed as a percentage of the distance from girdle to culet, which defines how much of the pavilion is taken up by the lower girdle facets. This matters because it influences the pavilion geometry and how light is guided through the lower part of the diamond. The other options describe different dimensions—crown height, the width of the facets, or the facet angle—none of which capture the percentage of the vertical distance spanned by the lower girdle facets.