A plain ring refers to a ring that does not contain any pure metal such as precious stones and diamonds.
There are many kinds of rings, which are classified according to different materials. But now many young people prefer simple style, the simpler the better, which is the plain ring we often see.
Plain ring is elegant and simple, which conforms to the modern life concept of breaking up. A small plain ring doesn't have to worry about choosing gems, and it doesn't have to be distracted by carving and decoration.
Thumb usually doesn't wear a ring. Wear it on the index finger to indicate marriage, unmarried, middle finger to indicate love, ring finger to indicate engagement or marriage, and little finger to indicate celibacy or divorce.