´It was narrated from Anas that :` The Prophet [SAW] put on a silver ring with and Ethiopian stone (Fass), on which the inscription was: "Muhammad Rasul Allah."
Explanation & Benefits
Hafiz Muhammad Ameen
For details, see Hadith: 5199.
Source: Sunan Nasa'i: Translation and Benefits by Shaykh Hafiz Muhammad Amin Hafizullah, Page: 5279