A ring piercing with a bead that fits into a small opening in the circle of the ring.
The bead is slightly larger than the opening and has small indentations or depressions that correspond to the ring's end-points so that it may fit snugly against them, thus completing the circuit of the ring. Often, a hole is drilled through the bead to allow easier fitting.
Captive bead rings can also have little accessories.
