What is a single cut diamond?
By Jared James · Last updated 21 May 2026
Definition
A single cut diamond is a round diamond with only 17 or 18 facets rather than the 57 or 58 facets of a modern brilliant cut. It has a small table, a flat base and a simple arrangement of triangular and rectangular facets around the crown and pavilion. Single cuts were common in antique jewellery before the full brilliant cut was developed, and they are still used today as small accent stones in watch bezels and pavé settings where the stones are too tiny for a full cut to make sense.
Frequently asked questions
- How does a single cut diamond differ from a full brilliant cut?
- A full brilliant cut has 57 or 58 facets, which are arranged to maximise light return and create the intense sparkle most people expect from a diamond. A single cut has only 17 or 18 facets, so it has a quieter, softer gleam rather than brilliant fire.
- Where are single cut diamonds used today?
- Mostly in very small sizes as accent stones, particularly in watch bezels and pavé settings on fine jewellery. When a diamond is too tiny to cut with full brilliant geometry without losing too much weight, a single cut is a practical choice.
- Are single cut diamonds worth less than brilliant cuts?
- Generally yes, because they have less brilliance and sparkle. In antique jewellery they are appreciated as part of the piece's historic character, and collectors who love old-cut diamonds sometimes seek them out specifically.
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