(Mech.) A small metal ring; a small collar fastened on an arbor; as, the collet on the balance arbor of a watch; a small socket on a stem, for holding a drill.
3.
(Jewelry)
(a)
The part of a ring containing the bezel in which the stone is set.
(b)
The flat table at the base of a brilliant. "How full the collet with his jewel is!"
