What is the amount of zakat that must be paid by someone who owns 85 grams of gold and has not paid its zakat for the previous four years? Is it 8.5 grams or only 2.125 grams?

Zakat (definition) is not obligatory on gold prepared for permissible use, according to the majority of scholars, and this is the issued fatwa (definition), but paying it is more cautious. Zakat is obligatory on gold if it reaches the nisab (definition), which is 85 grams of pure gold. If it is not pure, then the pure portion of it must reach the nisab. If the gold is subject to Zakat, then it must be paid for all past years, because Zakat does not lapse with the passage of time; it is a debt that does not discharge one's responsibility until it is paid. As for deducting the amount paid for the first year from the subsequent years, there is a difference of opinion among scholars.