It wasnarrated from Anas bin Malik that the Messenger of Allah (ﷺ)wore aring of silver, in which was an Ethiopian gemstone and theinscription:
'Muhammad Rasul Allah' (Muhammad the Messenger ofAllah)." (DE)
English reference (DE): Vol. 4, Book 32, Hadith 3641 (DE)
Arabic reference (DE): Book 32, Hadith 3772 (DE)