How should it fit?
How To Measure Your Ring Size
- The ring should fit your finger comfortably: snug enough so it won't fall off, but loose enough to slide over your knuckle with relative ease. A little wiggle over the knuckle is good. When the knuckle is bigger than the base of the finger, measure both places and pick a size in between the two. 
Size Difference
- The difference from one whole ring size to the next is a matter of 2-3mm in the circumference of the inner part of the band. 
Variances
- Many people find that a variance of a half size or less will still fit comfortably most of the time. 
- The wider the ring, the tighter it will fit on a finger. For anything 5mm+ in width, go a half size up. 
- The interior of a Comfort Fit ring puts less metal in contact with the finger, so they tend to fit a little loose. If you’re between sizes, round down. If you have large knuckles, you may need to go up a half size. 
- It’s also good to keep in mind that finger size fluctuates slightly based on diet, temperature and activity. The way your ring fits may change slightly over the course of a single day. 

 
                 
                 
                