Jewellery for woman

Assalam o alaikum,

Respected Mufti Saheb, I want to ask that whether women can wear imitation rings or bangles or earings Or rings or earrings made or iron or copper? Or they are only allowed to wear rings or earing of silver and gold ? Some says it is allowed and some says no. What is the correct ruling?
Thank You.
Jazzak Allah!