Must the wife return the gifts (wedding ring, ring, necklace) given to her by the husband before marriage? Are they counted as part of the deferred dower written in the list after divorce? And how is their value assessed if they must be returned?

A divorced man is not entitled to demand the return of the gold he gifted you before the marriage contract. Whoever gives a gift before consummation and then divorces has absolutely no right to reclaim it, whether it is still in existence or not. Therefore, you are not obliged to return the aforementioned gifts or their value.