I’m looking to make my first Cartier purchase: a white gold Juste un Clou ring (either the small model or the double wrap around). Unfortunately the closest Cartier store is 11 hours away, so I will need to order online. My ring size for the finger I want to wear it on is a 6.5, any idea what size ring I should get? From the sizing guide I could be a 53/54 but wanted to see if anyone had sizing advice before I online order.