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