Ruling 1916
In the event that minted gold and silver coins that are used by women as ornaments are used prevalently in transactions – meaning that gold and silver are used as money in transactions – then based on obligatory precaution, zakat is obligatory on them. However, if they are not used prevalently in transactions, then zakat is not obligatory on them.
-Ayatullah Sistani, Practical Laws of Islam, Alms Tax (Zakat)