In gemology, which of the following describes a facet?

A facet refers specifically to a flat, polished surface on a gemstone that is created during the cutting process. This smooth, reflective surface is essential for capturing and reflecting light, which contributes to the overall brilliance and visual appeal of the gemstone. Each facet is strategically placed to enhance the stone's ability to exhibit sparkle and color when viewed under different lighting conditions.

The other options describe various aspects of gemstones but do not accurately define what a facet is. The rough, uncut surface of a gem pertains to its natural state before it has been polished and shaped, while the natural surface texture found in raw gems refers to the inherent characteristics that remain untouched by the lapidary process. Similarly, an internal feature within a gemstone could refer to inclusions or structural characteristics, but these do not relate to facets, which are always external, polished surfaces.