Culet size is defined as the size of which part of the diamond?

• A. The facet at the bottom of the diamond where the pavilion mains meet.
• B. The width of the table facet.
• C. The distance from girdle to culet expressed as a percentage.
• D. The height of the crown.

Answer: (A)

Culet size refers to the size of the culet facet—the tiny bottom facet where the pavilion mains meet. This facet sits at the tip of the diamond, and its length can range from none (no culet) to very small, small, or larger, affecting how the bottom of the diamond looks in light and reflection. The other parts describe different features: the table width is the broad top facet, the distance from girdle to culet expressed as a percentage is about culet depth/position rather than its size, and the crown height is the vertical distance from the girdle to the top of the diamond. So culet size specifically is the size of that bottom facet.