The culet is an optional facet at the bottom of the diamond and its primary purpose is to prevent abrasions and chipping. Adding a culet to a diamond was much more common in the earlier days of diamond cutting and many antique cuts feature large culets. However in today’s market, diamonds without a culet are much more common and desirable. This is because culet size can negatively affect a diamond’s cut grade. A large culet may even appear as a noticeable black spot under the table. In general, the larger the culet the lower a diamond’s cut grade. There are 8 culet designations:
None: no culet
Very Small: very difficult to see at 10x magnification
Small: difficult to see at 10x magnification
Medium: easily distinguished at 10x magnification
Slightly large: obvious at 10x magnification and may be eye-visible
Large: very obvious at 10x magnification and typically eye-visible
Very large: distracting at 10x magnification and easily visible to the naked eye.
Extremely large: very distracting at 10x magnification and noticeable to the naked eye.
At NADB we recommend either none, very small or small culets. These culet sizes will ensure you are getting the best looking diamond possible.
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