Is it necessary to inform the bride's family of the monetary value of the gold when it is given as a dowry?

If the dowry is a known quantity of gold, then it is not necessary to inform the bride of the purchased gold's price, because her right is in the agreed-upon gold itself. However, if the dowry is cash, and the husband then buys gold with that cash, he must inform her of the price so that she may approve or reject this action, as she is not obligated to accept gold instead of the agreed-upon cash.