What is the ruling of Islamic law concerning a man who dissolved the engagement after the marriage contract (ketab al-ketab) was written, and refuses to give the fiancée more than half of the deferred dowry (mu'akhar), and demands the return of the jewelry (shabaka), knowing that she feels greatly wronged?

Divorcing a woman before consummation obligates half of the agreed-upon Mahr (dower), unless one of the parties waives their right, based on the Almighty's saying: "And if you divorce them before you have touched them and you have already specified for them an obligation [dower], then for them is half of what you specified - unless they [the women] forgo it or he in whose hand is the marriage contract forgoes it." The 'shabka' (engagement gift/jewelry) may be part of the Mahr or a gift. Divorce may be better, as in "But if they separate [by divorce], Allah will enrich each of them from His abundance." One must have good expectations of Allah and make abundant supplications, as there is no specific supplication for this situation.