One of the biggest problems with buying a ring online is getting the sizing correct. This is one of the main reasons we discontinued rings years ago. Please be aware that even if you purchase the wrong size, I assure you that we will take care of you. You will simply send the ring back and we'll ship you another size. That said, life would be much easier for all of us if we can try and get it right on the first round. Here are a few options...
• Go to a local jewelry store and ask them to size you.
• Download a printable ring sizer and give that a shot. You can do a quick search for these online and find quite a few.
• Try this interesting method Ring Sizer.com
• Order a plastic multi-sizer like this one Amazon multi-sizer
In my opinion, the best thing to do is get sized locally. The difference between half ring sizes are fractions of an inch so it's difficult to determine ring size.