What does "bezel" refer to in relation to gemstones?

The term "bezel" specifically refers to a decorative setting that holds a gemstone. This setting can be made of various materials, such as metal, and serves to keep the gemstone securely in place while also enhancing its visual appeal. Bezels can take various forms, including a closed bezel, which completely encircles the stone, or an open bezel, which allows light to pass through the sides of the gemstone for added brilliance.

Understanding the context of the term is crucial, as it distinctly relates to the craftsmanship involved in jewelry making. Other responses describe aspects related to gemstones but do not accurately reflect the function or definition of a bezel, making it clear why "A. A decorative setting that holds a gemstone" is the correct characterization.