(47) باب صِفَةِ خَاتَمِ النَّبِيِّ صلى الله عليه وسلم
It was narrated from Anas that :
The Prophet [SAW] wore a ring of silver with an Ethiopian stone (Fass), on which was inscribed (the phrase): "Muhammad Rasul Allah (Muhammad the Messenger of Allah)." (ID)
Reference (ID): Sunan an-Nasa'i 5196 (ID)
In-book reference (ID): Book 48, Hadith 157 (ID)
English translation (ID): Vol. 6, Book 48, Hadith 5199 (ID)