Sahih Bukhari Volume 007, Book 072, Hadith Number 757.
Narrated By Anas bin Malik : That he saw a silver ring on the hand of Allah's Apostle for one day only. Then the people had silver rings made for themselves and wore it. On that, Allah's Apostle threw away their rings as well. (For the details of this Hadith, see Fateh-Al-Bari, Vol. 12, page 438).