This ring is size 12. Say it with hearts...this heart shaped ring "Ring of Hearts" is 21.3 mm in diameter and 1.3mm thick. It is a size 12. The ring is wider on top, extending towards the knuckle to make it noticeable. It is designed to be worn on the right index finger, covering a larger area on the side of the finger. It is an open band, so that you could size it a little yourself.