Is zakat obligatory on a wife's gold, gifted to her at the time of marriage, which was sold to purchase land, and is zakat calculated for one year or from the date of purchase to the date of sale?

According to the majority of scholars, there is no zakat on gold used for adornment. If it is sold, there is no zakat on its price unless a full year has passed while it is at the nisaab (minimum taxable amount).