It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Noble Prophet (peace and blessings be upon him) had a ring made of silver with which he would seal (letters), and he would not wear it. Abu Isa Tirmidhi says: Abu Bishr's name is Ja'far bin Abi Wahshiyyah.
Hadith Referenceشمائل ترمذي / باب ما جاء فى ذكر خاتم رسول الله صلى الله عليه وسلم / 87