Pavilion, girdle, table, and culet are aspects of a what?
Culet length of the pavilion. With other gemstones that are not subject to cleavage, the culet is added to protect the fragility of the pointed tip. The culet has remained optional on many diamond cuts up to the present day, and was omitted from Marcel Tolkowsky's original designs for the round brilliant diamond cut in 1919. Nonetheless, culet facets are common on modern brilliant-cut diamonds. Culet In gemology, a culet is a flat face on the bottom of a gemstone. During the 14th century, after the adoption of the table cut, a further facet was added to the bottom of the
Brilliant (diamond cut) likely to be cut in a "fancy cut"—that is, a cut other than the round brilliant—which the particular crystal shape lends itself to. The original round brilliant-cut was developed by Marcel Tolkowsky in 1919. The modern round brilliant consists of 58 facets (or 57 if the culet is excluded), ordinarily today cut in two pyramids placed base to base: 33 on the "crown" (the top half above the middle or "girdle" of the stone), truncated comparatively near its base by the table, and 25 on the "pavilion" (the lower half below the girdle), which has only the apex cut off