How is the zakat calculated for gold that consists of a wife's gift, a wedding dowry, and personal savings?

The wife's gold does not require zakat from the husband. The obligation of zakat on it falls upon her if it reaches the nisab, a year has passed over it (hawl), and it is not jewelry kept for adornment. If the husband wishes to pay its zakat on her behalf, he must inform her. As for the gold owned by the husband, zakat becomes obligatory on it if its weight reaches eighty-five grams of pure gold and a year has passed over it (hawl), and he pays a quarter of a tenth (2.5%) of its value.