1. If you are between sizes, order a larger size. It's much easier to size down on a ring than to size up if you need to have it re-sized.
2. When measuring, make sure your finger is at a normal body temperature. Fingers tend to expand when hot, and shrink when cold, and the difference could be up to a full size or more! So don't measure after you've been to the gym, or if you're outside on a cold day, for example.
3. When measuring, make sure you can slide the ring on and off your finger, over the knuckle. You're looking for a snug, not tight fit.
For more ring sizing tips and tricks, visit our sizing page.