Haq Mehar Moajjal
In principle, if the jewelry was given to you as a loan or if you promised to buy her similar jewelry later then you must give her back what you borrowed. In family matters with a sense of urgency wives normally do not set explicit conditions at the time of offering to help with their assets. With that in mind, even if there was no understanding of loan at the time she offered to help, it will be advisable that you give her back something similar if you can afford to do so.