The 49 fits with wiggle room for swelling in the warmer months. Definitely happy I tried it and did not settle with the size 50. I love it!! So fun but yet easy to wear. This is my second Cartier purchase and I am so happy with the online ordering, shipping and service. I called today to get a return authorization number for the size 50 and the women on the phone was pleasant and helpful. Can’t wait to wear this little ring all the time .