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Gemstone Facets: Terminology and Functions - International Gem Society
Culet. The point at the bottom of the pavilion is called a culet. Some gems have tiny, flat culets instead of points. This helps prevent chipping. Keel. Some faceted gems have neither a pointed nor flat culet. Some cuts, like ovals and emerald cuts, have a keel at the bottom of the pavilion, an edge like the bottom of some boats. Photo 1 shows the girdle and culet of a re-cut spinel gemstone ...