The second Biblical use of rings has to do with a ring of authority called a signet ring. The signet ring, or seal ring, was a symbol of authority and gave the wearer legal rights to transact business. When a slave named Joseph was called before Pharaoh, the king of Egypt, he was promoted to being second in command over the entire country. So he set him over all the land of Egypt. Because of the ring legally placed on his finger, when Joseph spoke, it was as if Pharaoh spoke.
Rings also speak of restoration.
In the story of the prodigal son, the wandering son returned home morally ruined and bankrupt. When this ring was again placed on this wayward son's finger, he could again transact family business in full authority as a son. This ring restored his dignity and told all who saw it on his finger he was again his Father's beloved son. And we are sealed with the King's signet ring, his stamp of ownership and authority, sealed with the blood of the Lamb.