The ring.
There are many rings.
The boxing ring , the wrestling ring
There is the high school, college ring
The the best ring of all ,
The wedding rings.
This ring means more than any of  the many rings there is.
Friendship between two, love for the two.
And happiness only if the ring is not broken.
The ring, a circle more than what it is. So simple it has so much to stand for.
But just gold or silver the ring fits on your finger.