Musnad Abu Ya'la al-Mawsili 209:74

Daud ibn Rashid narrated to us, Muhammad ibn Salamah narrated to us, Khasif narrated to us, from Mujahid, from Aisha, who said: When the Messenger of Allah (peace be upon him) forbade the wearing of gold, we said: "O Messenger of Allah, shall we not bind musk with gold?" He said: "Shall you not bind it with silver, then smear it with saffron, so it becomes like gold?"