The narrow band around the outer circumference of a diamond.
The jewelry setting usually holds the diamond around the girdle. Girdles can be rough (looks sandblasted) or faceted (polished like the rest of the diamond). Rough girdles tend to be poorly made, and they may not look as good, and often include bearding, abrasions, or chips. Our favorite girdle is somewhere between Thin to Thick and Polished or Faceted.
Girdles are found in many different conditions and stages, including:
You can also put a laser inscription on the girdle, with anything from a company logo, to a private message, such as this: