It is narrated from Sayyiduna Anas (may Allah be pleased with him) that whenever the Messenger of Allah (peace and blessings be upon him) went to the toilet, he would take off his ring.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 449
It is narrated from Sayyiduna Anas (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) made a silver ring, then threw it away. The Shaykh said that the narration of Ibn Jurayj is better known than the hadith of Hammam.
Abu Dawud said: This hadith is munkar (denounced); it is only known through Ibn Jurayj, from Ziyad bin Sa'd, from al-Zuhri, from Anas.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 450
It is narrated from Sayyiduna Anas (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) wore a ring whose engraving was 'Muhammad Rasulullah' (Muhammad is the Messenger of Allah) (peace and blessings be upon him); whenever he (peace and blessings be upon him) went to the toilet, he would take it off.
This is a weak supporting narration (shahid).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 451