Ring is like a circle, made with metal, worn as jewelery around the finger, it is the common and proper meaning of the word “ring“. A normal ring is a finger ring. other types of rings worn as ornaments are earrings, bracelets for the wrist, armlets or arm rings, toe rings and torcs or neck rings, but except perhaps for toe rings, the plain term “ring” is not normally used to refer to these.
Rings are traditionally usually in metal but can be of almost any material: metal, plastic, stone, wood, bone, glass, gemstone to name a few. They may be set with a gem or stone of some sort, which is often a precious or semi-precious gemstone such as diamond, ruby, sapphire or emerald, but can also be of almost any material.