Al-Zuhri (may Allah have mercy on him) narrated from Sayyiduna Anas (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) had a silver ring made and wore it on his right hand. Its stone was Abyssinian, and the Messenger of Allah (peace and blessings be upon him) used to keep it towards his palm.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7566