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