Necklace. Made out of half a dragon's tooth. [Glancing at him, waiting to see if there's any spark of recognition from Bucky... maybe if he's seen it....]
It's a bit hard to miss. It's big. And pretty. Means a lot.
[He doesn't go into more explanation, though. It's more than just sentimental to him - it's the mark of his relationship with Dorian, the necklace of kadan, where two people can be connected no matter how far away they were. Even with Dorian here, in a lot of ways he wasn't 'his' Dorian, and the necklace at least helped him feel calmed about being in a strange, unknowable place with all this strange magic. With all his fear about losing control of his own mind, being left after an AU event that literally messed with his head, and then being without that anchor, has left him a little more than unsettled]