I am thinking specifically about a right hand Tiffany celebration ring with round diamonds going all the way around it. Should this be a gift from a guy? Does it look funny to wear if you are not married?
I think they're pretty too... you should get it. Are you going to wear it on the same finger as if it was a wedding band? I'd maybe just choose a different finger. No one will think anything of it. There are lots of bands like that, esp. people stack them. Get it!
Go for it! However, if you're going to purchase just one this time I'd just put it in the middle finger so it doesn't look like a wedding band or something like that. Otherwise, a stack of rings in the ring finger.