Cavity in G Color I1 diamond

A cavity in a diamond is exactly what it sounds like: a small hole or deep indentation that reaches into the surface of the stone. It forms when an internal crystal or inclusion falls out during the polishing process, leaving behind an open pocket.

In this 1.00 carat G color I1 clarity diamond, the lower pavilion features a cluster of inclusions, most notably a feather and a cavity near the edge. While feathers dominate the clarity plot, the cavity is marked near the 5 o’clock position and is responsible for the open surface area that can trap dirt or affect brilliance. Although the inclusion is not sharply defined as a standalone cavity, it gives a real-world look at how a cavity can appear when mixed with other clarity characteristics. This example also highlights why it’s important to examine images alongside grading reports, not all inclusions are perfectly isolated in appearance.

A cavity near the crown or girdle is unlikely to affect brilliance and may even be covered by a prong in the setting. But if it’s near the pavilion or directly under the table, it can catch the light in a distracting way or reduce clarity. Larger cavities may also become weak points if placed near edges or corners, particularly in fancy-shaped diamonds.