The standard for the size of the finger ring of a ring is called the hand size and is counted by number. Most people's hand size is between 4 and 26. The safest measurement method is to ask the clerk of the jewelry store to measure for you two. You can also use the method published on the Internet to measure it yourself: find a string or a piece of paper and surround your finger. Make a circle around the place where you wear the ring, use a pen to mark the overlap on the rope or paper strip, then measure the length with a ruler, and compare it with the hand-size comparison table.