facet
smooth, nearly flat articular surface
A facet refers to one of the flat, polished sides of a cut gemstone. A gemstone will typically be cut into several facets arranged in a pattern that allows the stone to reflect light in a desirable way and enhance its visual appeal. The goal of cutting a stone into facets is to maximize its brilliance and fire (the ability to disperse light into its spectral colors). The number, size, shape, and arrangement of facets can have a significant impact on the beauty and value of a gemstone. Facets are a key element in the process of cutting and polishing gemstones, and the art of gem-cutting is highly prized among jewelers and collectors around the world.
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