How to measure ring size ?
Here are the detailed steps for measuring ring size
Wrap a soft and thin red string (or use other soft lines, but it is better not to use hard objects as they can cause inaccurate measurement results) around the finger on which you want to wear the ring, not too tight or too loose to ensure comfort and accuracy. You can also choose the middle finger as its size is usually similar to other fingers.
Use a pen or marker to mark the two endpoints of the string around the finger.
Remove the string from the finger and use a ruler or tape measure to measure the distance (in millimeters) between the two marked points.
Then find the corresponding ring size number from the sizing chart image.