Musnad Abu Ya'la al-Mawsili 118:49

Uthman ibn Abi Shaybah narrated to us, Talhah ibn Yahya narrated to us, from Yunus, from Ibn Shihab, from Anas: That the Messenger of Allah (ﷺ) wore a silver ring on his right hand, in which there was an Abyssinian stone. And its stone was on the side facing his palm.