بسم الله الرحمن الرحيم
(Fatwa: 1294/885/L=11/1434)
The wife alone is responsible to pay the zakah of her jewelleries which is in her possession. If your wife sells some jewelleries and pays zakah with it and comes out of nisab then she may do so. Likewise she also may come out of nisab by selling some jewelleries for any other purpose.
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband
