Zakat is obligatory on gold and silver when they reach the nisab, whether in cash or bullion.

The nisab for gold is twenty mithqals or dinars, equivalent to eighty-five grams of pure gold.

Historians and legislators unanimously agree that Sharia specifies the official dinar's weight as 4.25 grams, thus making the nisab for gold 4.25 × 20 = 85 grams of gold.

As for silver: its nisab in modern weight is 2.975 × 200 = 595 grams of silver.