Use this to standard US sizing ring sizer before placing an order or purchasing a ready-to-ship ring. You may also ask your local jeweler to size your finger, or download an online template. I always recommend getting your finger size with an actual sizer to ensure a perfect fit.
This ring sizer works like a belt. Push the end through the buckle to form a ring shape. Slip ring sizer onto your finger. Adjust to give a comfortable fit, checking that it just slips back over the knuckle.
When best fit is achieved, read off size indicated by the arrow.