In his answer to this case Dr. Monzer Kahf, Scholar in Islamic Economics & Financial Expert, who stated,
Women gold and silver jewelry that are intended as a store of wealth are subject to Zakah. If the questioner did not use them yet and she intends to buy more gold to preserve the value. It seems to me, based on what she stated, that the jewelry is subject to Zakah.
the way we calculate it is: after 354 days from the day she acquired Nisab for the first time (value of about US$ 1500+-) add the amount of cash that she has + the value of gold and gold jewelry + net worth of any business she may own + any debt she may own on other persons provided it is certain that she will collect them. All that should be multiplied by 2.5% and the amount of Zakah paid to deserving categories as mentioned in Allah’s saying:“The alms are only for the poor and the needy, and those who collect them, and those whose hearts are to be reconciled, and to free the captives and the debtors, and for the cause of Allah, and (for) the wayfarer; a duty imposed by Allah. Allah is Knower, Wise.” (At-Tawbah, 9:60)
May Allah guide all to what pleases Him!