Culet size is the word that a report uses for the size of the culet. The eight words are None, Very Small, Small, Medium, Slightly Large, Large, Very Large and Extremely Large.
In more detail
None means that there is no culet facet: the mains meet in a point. The smallest sizes are judged by eye at 10x. GIA's cut booklet allows Excellent with a culet of Small or less, and Very Good with Medium. In our Cut Grading Tool, which reads GIA's tables, Extremely Large drops a T73 to Poor.
On a grading report
On the proportion diagram as a word.
Related terms
- Culet: The culet is the bottom point of the pavilion. It can also be a tiny facet, parallel to the table, that keeps the point from chipping.
- Cut grade: The cut grade rates how well a diamond's proportions and finish work, from Excellent to Poor. GIA gives it only to standard round brilliants in the D-to-Z color range.
- Proportion diagram: The proportion diagram is a side-view profile of the stone, drawn to its measured proportions. It shows the table, depth, crown, pavilion, star and lower half lengths, girdle and culet.