What does Polish describe in a finished diamond?

• A. The overall condition of the facet surfaces of a finished diamond.
• B. The pattern of bright and dark areas.
• C. The angle of incidence relative to the surface.
• D. The distance light travels in the gem.

Answer: (A)

Polish describes the condition of the facet surfaces after finishing. It refers to how smooth and free of microscopic scratches the facets are, since these surface details directly affect how cleanly light can reflect off the diamond. Good polish allows light to bounce and return with maximum brilliance, while poor polish scatters or dulls light because the roughness and scratches disrupt the reflections. The other ideas relate to different aspects of light behavior in a diamond: the pattern of bright and dark areas comes from how light is distributed by the cut and symmetry, the angle of incidence is about facet angles and geometry, and the distance light travels inside the gem is an optical path consideration—not the surface finish.