"I heard Ibn 'Umar say: 'The Messenger of Allah forbade wearing gold unless it is broken (into smaller pieces).'"
Sunan an-Nasa'i Book 48, Hadith 121
← Previous Hadith "I heard Mu'awiyah say to a group of Muhajirun and Ansar who were around him: 'Do you know that the Messenger of Allah forbade wearing silk?' They said: 'By Allah, yes.' He said 'And (he forbade) wearing gold unless it was broken (into smaller pieces)?' They said: 'Yes.'" 'Ali bin Ghurab contradicted him; he reported it from Bahais, from Abu Shaikh, from Ibn 'Umar.

Sunan an-Nasa'i Book 48, Hadith 120 Next Hadith → His nose was cut off at the battle of Al-Kulab during the Jahiliyyah, so he wore a nose made of silver, but it began to rot, so the Prophet told him to wear a nose made of gold.

Sunan an-Nasa'i Book 48, Hadith 122