Learn about Culet 

A diamond's culet is the point on the bottom of a diamond's pavilion. A diamond's culet may be pointed or it may be blunted with a small facet. The culet facet can vary in size. This culet's size determines the grade that the culet is assigned. When searching for your diamond you should choose a diamond within this range: pointed or no culet, very small, small or medium. Diamonds that possess culet sizes in these ranges are considered Ideal to Very Fine. Diamonds within these ranges do not have culets that are visible to the naked eye when viewed from of the top of a diamond through the table facet.

 Diamonds that have culet facets that are large to extremely large are less desirable because the culet facet may be visible to the naked eye when viewed through the table facet. Large culets are common in diamonds that were cut in the early part of this century. They are often referred to as Old European or Old Mine Cut Diamonds. Large culets may also indicate the culet is chipped or broken off. Below is GIA's and other gemological laboratories' list of abbreviations used on diamond certifications that grade the condition of a diamond's culet.

N, NO, NON, - No Culet 
P, PO, PN, PNT, - Pointed 
VS, VSM, VRSM, - Very Small
S, SM, SML, - Small
M, ME, MD, MM, - Medium
L, LA, LG, - Large
VL, VLG, VRLG, - Very Large
EL, EX, EXLG, - Extremely Large