What is the amount of zakat that must be paid for one hundred and seventy grams of gold?

The zakat threshold for gold and silver is determined by their pure content; the amount of alloy is disregarded, and zakat is paid on the pure metal. The zakat threshold for pure gold (24-karat) is 85 grams. To calculate the threshold for lower karats, multiply the grams by the current karat and divide by 24. If the result reaches 85 grams or more, zakat becomes obligatory at 2.5%. For example: 170 grams of 21-karat gold are calculated as follows: (170 × 21) ÷ 24 = 148.75 grams of pure gold, and its zakat is 2.5%, which is approximately 3.7 grams.