Lucifer has a ring he (almost) always wears on his right middle finger.

( It's a very special ring )

Lucifer has had that ring for as long as most can remember, just suddenly having it one day. He has never outright answered where it came from - or what it's made from, as the over half the metals are classed as 'rare Earth metals' and there are six different types that do not match any known metal in the universe. When pressed about it, he's been known to chuckle quietly and state that the gears are made from the souls of those who have exceptionally annoyed him. No one is willing to say one way or the other if he is joking or not.