When the Prophet (ﷺ) intended to write to the Byzantines, it was said to him, "Those people do not read your letter unless it is stamped." So the Prophet (ﷺ) took a silver ring and got 'Muhammad, the Apostle of Allah' engraved on it .... as if I am now looking at its glitter in his hand.
Sahih al-Bukhari Book 77, Hadith 92
← Previous Hadith The Prophet (ﷺ) got a ring made for himself and said, "I have got a ring made (for myself) and engraved a certain engraving on it so none of you should get such an engraving on his ring." I saw the glitter of the ring on his little finger.

Sahih al-Bukhari Book 77, Hadith 91 Next Hadith → The Prophet (ﷺ) had a golden ring made for himself, and when he wore it. he used to turn its stone toward the palm of his! hand. So the people too had gold made for themselves. The Prophet (ﷺ) then ascended the pulpit, and after glorifying and praising Allah, he said, "I had it made for me, but now I will never wear it again." He threw it away, and then the people threw away their rings too. (Juwairiya, a subnarrator, said: I think Anas said that the Prophet (ﷺ) was wearing the ring in his right hand.)

Sahih al-Bukhari Book 77, Hadith 93