"Used" Engagement ring

[tek]

If you sell, you'll only get 1500 if your lucky (and if it's 1 ctor larger and good C's).

I would do what the other guys suggested: keep it until you get another fiance. Go "shopping" with her and see what setting she likes. Then go back wihtout her and have the jewler reset the stone in the setting shee likes. Take the old setting and sell it at a pawn shop or try to get some discount on the new seeting with it.