Abdullah ibn Ja'far · The Book of Adornment

A man came to the Prophet and he was wearing an iron ring. He said: "Why do I see you wearing the jewelry of the people of Hell?" He threw it away, then he came and he was wearing a brass ring. He said: "Why do I notice the stench of idols from you?" So he threw it away, and said: "O Messenger of Allah, what should I use?" He said: "Silver, but it should not equal a Mithqal."

The Messenger of Allah discarded it, and the people discarded their rings. Then he acquired a ring of silver with which he used to seal letters, but he did not wear it.