It wasnarrated from Anas bin Malik that the Messenger of Allah (ﷺ)wore asilver ring with an Ethiopian gemstone, and he used to ear thestonein towards his palm. (RU)
English reference (RU): Vol. 4, Book 32, Hadith 3646 (RU)
Arabic reference (RU): Book 32, Hadith 3777 (RU)