What are the small, flat, polished surfaces on a finished diamond called?

The small, flat, polished surfaces on a finished diamond are referred to as facets. Facets are the specific geometrical surfaces that enhance a diamond's brilliance and sparkle by refracting and reflecting light. Each facet is precisely cut and positioned to interact with light in a way that contributes to the overall visual appeal of the stone.

Facets are essential in defining the diamond's shape and overall appearance, as they allow for the intricate play of light that makes diamonds so desirable. The arrangement and quality of the facets play a critical role in a diamond's fire, brilliance, and scintillation, which are crucial attributes for assessing a diamond's beauty.

In contrast, girdles are the outer edge or perimeter of a diamond, pavilions refer to the lower part of the diamond below the girdle, and poles are the top (table) and bottom points of the diamond. These terms describe different aspects of a diamond, but they do not refer to the small, flat surfaces that are pivotal to a diamond's light performance.