The Messenger of Allah said: "Allah has permitted silk and gold to the females of my Ummah, and has forbidden them to the males."
Sunan an-Nasa'i Book 48, Hadith 226
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Sunan an-Nasa'i Book 48, Hadith 225 Next Hadith → "I was forbidden to wear red garments and gold rings, and to recite Qur'an when bowing."

Sunan an-Nasa'i Book 48, Hadith 227