Signet-Rings (Kitab Al-Khatam)
Dawud :: Book 34 : Hadith 4225
Narrated A sister of Hudhayfah:
The Prophet (peace_be_upon_him) said: You women folk, have in silver something with which you adorn yourselves. I assure you that any woman of you who adorns herself with gold which she displays will be punished for it.