In accordance with the present invention, a method for forming a watch strap part includes the steps of: placing an insert plate within a mold; and injecting a moldable material into the mold around the insert plate so as to at least partially embed the insert plate and form a body of the watch strap part with the insert plate defining a floor of a recessed portion formed in the body of the watch strap part. The recessed portion is configured to receive a decorative insert that is securely attached to the insert plate and provides a decorative appearance.