I don't wear one myself, because I'm not married
However, I think our hospital policy is that one plain wedding band may be worn.
Of course I see nurses wearing all manner of rings

...one wears a particularly large claw-set engagement ring. I cringe when I think of the infection control risk, and how easily that could scratch a baby or kiddies skin (work in paeds).
So my advice would be...a nice rubover setting or plain band...or get something super sparkly and gorgeous, and just wear when not at work!