Sayyiduna Anas bin Malik (may Allah be pleased with him) narrates that when the Noble Prophet (peace and blessings be upon him) intended to write a letter to the Romans, the people said to him that they only read a letter which has a seal on it. So the Noble Prophet (peace and blessings be upon him) had a silver ring made. It is as if I am still seeing the whiteness of that ring in the hand of the Noble Prophet (peace and blessings be upon him). The words "Muhammad Rasul Allah" were engraved on it.
Hadith Referenceالفتح الربانی / كتاب اللباس والزينة / 7979
Hadith Gradingمحدثین:صحیح
Hadith Takhrij«أخرجه البخاري: 7162، ومسلم: 2092، (انظر مسند أحمد ترقيم الرسالة: 12720 ترقیم بيت الأفكار الدولية: 12750»
Brief Explanation
Benefits: … The reason for having the words "Muhammad Rasul Allah" engraved on the ring was to make it a seal.