Musnad Ahmad 30:1297

Abu Amir narrated to us, Zuhayr narrated to us, from Usayd ibn Abi Usayd, from Nafi ibn Ayyash, the freed slave of Aqilah bint Talq al-Ghifari, from Abu Hurayrah, from the Prophet, peace and blessings of Allah be upon him, who said: "Whoever loves to encircle his beloved with a collar of fire, let him encircle him with a collar of gold. And whoever loves to bracelet his beloved with a bracelet of fire, let him bracelet him with a bracelet of gold. And whoever loves to ring his beloved with a ring of fire, let him ring him with a ring of gold. But you must use silver; play with it as you wish, play with it as you wish."