Diamond Culet

Diamonds are unique gemstones. However, most of them share some structural features, and one of them is culet, which is the bottom tip or point of a diamond. A diamond can either have a pointed culet basically described as “none” on grading reports or an additional rough to the diamond’s table. The culet (pronounced as cue-let) in a diamond is an additional facet to the total number of diamond’s facets. In some cases, you will find out that a brilliant-cut has 57 facets, and some 58; the 58th facet is the culet.

Grading of Diamond Culet

The culet is a segment of the cut grade. During the manufacturing process, the culet is often polished as a flat facet so that it does not get chipped. Nowadays, the cutter usually closes this facet up to a certain point, and sometimes it is left as a small extra facet. Its small size is advantageous as it protects the culet from chipping when the diamond is handled, or the stone is being set.

There are different grading scales for diamond color, carat, and cut. The most popular grading standard is the GIA (Gemological Institute of America). On the GIA scale, the culet is described based on its size. The grades used include:

  • none
  • very small
  • small
  • medium
  • slightly large
  • extremely large

Impact of Culets on a Diamond

The main benefit of the culet is that it protects the diamond bottom from chipping. Its detriment is a flat facet that is parallel to the table such that you can see through the diamond from the top via the culet. The bigger the culet, the more you can see through the diamond. However, its large size makes the diamond look like it has discoloration or a large inclusion.

The Culet size is always noted on the diamond’s certificate, that is, if the diamond is certified. Therefore, as long as the culet is proportional and symmetrical with the diamond, it does not hurt the diamond in any way.

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