my tiffany necklace only looks good with polos??

It really depends. I think it can work w/ other necklines, but certain necklines may not work, like a really low v-neck. I'd just try it out and see w/ individual tops, but I don't think there is a hard and fast rule w/ necklaces this length.
 
It really depends. I think it can work w/ other necklines, but certain necklines may not work, like a really low v-neck. I'd just try it out and see w/ individual tops, but I don't think there is a hard and fast rule w/ necklaces this length.

i agree that you probably need to do a bit of trial and error and try it on with different tops. But because it is a chunky kind of choker, i think it would look great with a lowcut top or blouse or certain dress styles - see how you go