It's ok, you can just order whichever ring you want and send me a message (or leave a note during checkout) that you need a ring sizer and I'll send one out in the post free of charge. You get to keep it too!
Alternatively you can measure your finger. Or your bestie's when they're sleeping if this is a surprise.
Wrap a piece of paper around the finger, mark where it overlaps, and measure it with a ruler. Compare that measurement to the Inside Circumference column of the chart below and we should be good to go. Need help? Just send a message!