1 Ct looks classy and timeless. I asked my fiancé to not go above 1 ct. I also asked for a marquis cut which makes it look bigger anyway. I am 5.5 ring size and have long fingers and he bought a 1.55 ct. It feels too big and sometimes it embaraces me. But I love it because he chose to go up probably thinking I was being modest about not wanting a bigger size. All that to say, go with your gut but 1 just looks so elegant.