Marla Aaron lock. "When you throw it, it returns to you. When you throw it, it returns to you" There is something deeply emotional about this. It is a love that will always come back. It is not ephemeral. Marla made a Boomerang Lock because it felt very sentimental – this idea of a love always returning. This 14k yellow gold lock is 2.6cm x 8.4mm with thickness of 2.2mm and a 5mm closure.