‘Abdallah b. Ja'far said the Prophet used to wear a signet-ring on his right hand.
Ibn Majah transmitted it, and Abu Dawud and Nasa’i transmitted it on ‘Ali’s authority.
‘Ali, pointing to the middle finger and the one next it, said, “God’s messenger forbade me to wear a signet-ring on this finger of mine or on this.”
Muslim transmitted it.