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)." (ID)
English reference (ID): Vol. 4, Book 32, Hadith 3641 (ID)
Arabic reference (ID): Book 32, Hadith 3772 (ID)