I've had the same problem, even more annoying as I'm a keen knitter and it kept getting caught. I took mine to a local jeweller for advice and they remodelled it into one with a (I think) rub over setting, so the stones are set into a sort of frame, so avoiding any catching. As it was quite worn and thin, they also added some gold to the shank to thicken it up a bit and make it stronger. I think I paid about £300, which sounds a lot, but it was well worth it. I took mine to a local independent jeweller as the big chains wanted to charge a fortune - not that £300 isn't a lot, but they wanted a lot more. Good luck.