My dad took apart an old radio/CD player today, and that gold part was in it! I saw it and IMMEDIATELY thought of a keyhole, so I put it with my key charm on a necklace and got this. I swap out charms or add them on the chain to make different necklaces.

UPDATE: these are now on a black ribbon! looks so much better. I decided to switch it when i went to the Emilie Autumn concert.