Culet none意思

"Culet None" is a term used in the grading of diamonds and other gemstones, specifically referring to the pavilion of the stone. The culet is the small point at the very bottom of the pavilion, where the facets meet. A "culet none" grading means that there is no visible culet, or the culet is extremely small and does not affect the overall appearance or durability of the stone.

In older or lower-quality diamonds, a culet may be intentionally left as a small flat facet to prevent chipping. However, in modern diamond cutting practices, the goal is to eliminate the culet entirely or make it so tiny that it cannot be seen under normal magnification. A "culet none" grading is generally considered a positive attribute, as it indicates a well-cut stone with a strong emphasis on symmetry and precision.