A cavity is a small dent, hole or indentation in the surface of a diamond or precious gemstone resulting from an inclusion near the surface being dislodged during the cutting and polishing process. Cavities are usually very small and only visible under 10x magnification, and they do not often affect the clarity rating of a diamond. The photo at right depicts a tiny pin hole diamond cavity on the surface of a diamond's table.
See Also: Knot, Natural, Blemish