An accessory adapter for mounting an ornamental piece with two opposing edges. The adapter has a body with two spaced members forming a cavity therebetween for receiving one of the edges. The body also has an exterior surface configured to be fixed to an anchoring portion for mounting the adapter on a human body or object. A movable member is rotatably mounted on the body and rotatable to engage the other edge of the two opposing edges to releasably secure the adapter to the ornamental piece.