Sayyiduna Buraidah Aslami (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings be upon him) saw a man wearing a gold ring on his hand and said: What has happened to you? You are wearing the ornaments of the people of Paradise (which are not permissible in this world)? He said: Then I came to you, O Messenger of Allah (peace and blessings be upon him), wearing a brass ring, but this time you said: I sense the smell of idolaters from you. He said: Then, O Messenger of Allah, from what should I make a ring? The Prophet (peace and blessings be upon him) said: Have it made from silver.
Hadith Referenceالفتح الربانی / كتاب اللباس والزينة / 7974