bezel

noun

1. The sloping edge or face on a cutting tool.
2. The oblique side or face of a cut gem; especially the upper faceted portion of a brilliant (diamond), which projects from its setting.
3. The rim and flange which encompasses and fastens a jewel or other object, such as the crystal of a watch, in the cavity in which it is set.

   ““There,” she went on, “it must be one like to it, and yet never did I see one like to it, for thereto hung a history, and he who wore it prized it much. But the scarab that I knew was not set thus in the bezel of a ring.”

4. The panel that covers the front of a computer case, or the panel covering each drive bay that can be removed to install a removable drive that requires external access, such as a CD/DVD-ROM drive, which usually has its own preinstalled bezel.
5. The area on the front of a computing device surrounding the display.

   “Modern smartphones have very thin bezels.”