Abu Tha'laba al-Khushni · The Book on Clothing

"I saw Ibn Rafi' said: "The Messenger of Allah (ﷺ) wore a ring on his right hand." He said: Muhammad said: "This is the most correct thing related from the Prophet (ﷺ) on this topic."

"The Messenger of Allah (ﷺ) had a ring made from silver, so he had 'Muhammad, the Messenger of Allah' engraved on it. Then he said: 'Do not engrave with it.' This Hadith is Sahih Hasan. As for the meaning of his saying: "Do not engrave with it" - he was prohibiting that anyone have "Muhammad, Messenger of Allah" engraved on his ring.