Gold: twenty-mithqal nisab; half a mithqal initially due; two more qirats for each complete additional four mithqals.
Silver: two-hundred-dirham nisab; five dirhams initially due; one more dirham for each complete additional forty dirhams.
Both have the basic one-fortieth (2.5%) rate. In both, the jurists differ about the fractional amounts between incremental thresholds.