Abstract: A necklace adapter for use with a smart watch is described. The necklace adapter generally includes an adapter base for connection to the smart watch and a retainer assembly for releasable attachment to a necklace of a user. The retainer assembly includes a hollow lower stem attached to the adapter base and having a first clasp member and a solid shaft, movably mounted within the lower stem, having a second clasp member. The solid stem and second clasp member are movable from a first closed position forming a closed loop with the first clasp member to a second open position spaced from the first clasp member. A spring is provided to bias the solid stem and second clasp member to the first closed position. In one embodiment, the retainer assembly is connected to the adapter base by a ball joint connection to adjust the position of the smart watch for the convenience of the user.