‘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.
‘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.
He said God’s messenger wore on his right hand a silver signet-ring with an Abyssinian stone, and put its stone next the palm of his hand.
(Bukhari and Muslim.)