Yahya related to me from Malik from Abdullah ibn Dinar from
'Abdullah ibn 'Umar that the Messenger of Allah, may Allah bless him
and grant him peace, used to wear a gold ring. Then the Messenger of
Allah, may Allah bless him and grant him peace, stood up and threw it
away and said, "I will never wear it." He said, "So the people threw
away their rings."
Muwatta Malik Book 49, Hadith 39