I'd keep it for the sake of having it but I'm a packrat.
See I'm normally the same, I have single roses kept in my MH that I got back when I used to roleplay extensively in Vana'diel, but as lately I'm actually playing the game as opposed to just hanging out with the people, I've tried to be a bit more frugal with my storage space, especially since I've now taken up Dancer in addition to Scholar, so I'm storing gear for that as well as the NIN and WAR subjobs. So things like the fully used Novennial Ring, which under normal circumstances I'd have kept, are getting dumped if they have no practical reason to be there other than nostalgia.
Catwho and Fynlar, thanks for the advice, the ring has been dumped. Edited, Aug 5th 2012 10:33pm by Drusenija