What is a facet on a gemstone?
By Jared James · Last updated 21 May 2026
Definition
A facet is one of the flat, polished surfaces ground onto a gemstone by a cutter or lapidary. Each facet is precisely angled so that light entering the stone bounces between surfaces and exits back through the top, creating sparkle and brilliance. A standard round brilliant diamond has 58 facets, and different cut styles arrange those faces in different patterns to produce different optical effects. Facets can also occur naturally in some minerals, though in jewellery the term almost always refers to intentionally cut surfaces.
Frequently asked questions
- How many facets does a round brilliant diamond have?
- A standard round brilliant diamond has 58 facets, sometimes 57 if the culet is omitted. They are arranged in precise groups on the crown, girdle and pavilion, each one angled to direct light back through the top of the stone.
- What is the difference between a faceted stone and a cabochon?
- A faceted stone has multiple flat polished surfaces cut onto it to create sparkle, while a cabochon is polished to a smooth dome with no flat faces. Cabochons suit opaque or strongly patterned stones, while faceting is used to maximise brilliance in transparent gems.
- Can facets affect a stone's value?
- Yes, the quality of the facets matters. Flat, well-polished facets with crisp edges and correct angles let light behave as intended, while poorly placed or uneven facets scatter light and reduce a stone's beauty and grade.
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