"The Messenger of Allah came out wearing a silver ring. He said: 'Whoever wants to make a ring like this, let him do so, but do not put the same inscription.'"
Sunan an-Nasa'i Book 48, Hadith 168
← Previous Hadith "A man came from Al-Bahrain to the Prophet and greeted him with Salam, but he did not return his greeting. He was wearing a gold ring on his hand, and was wearing a silken Jubbah. He took them off, then he greeted him with Salam, and he returned his greeting. Then he said: 'O Messenger of Allah, I came to you just now, and you turned away from me.' He said: 'You had a coal of fire on your hand.' He said: 'Then I have brought many coals.' He said: 'What you have brought with you is no better for us than the stones of Al-Harrah, but it is a temporary convenience of this world.' He said: 'What should I use for a ring?' He said: 'A ring of iron or silver or brass.'"

Sunan an-Nasa'i Book 48, Hadith 167 Next Hadith → "The Messenger of Allah put on a ring, and he had some words inscribed on it. He said: 'We have put on a ring and have had some words engraved on it; no one of you should copy this inscription.'" Then Anas said: "It is as if I can see its whiteness on his hand."

Sunan an-Nasa'i Book 48, Hadith 169