Two questions must be distinguished: when gold zakat first becomes due, and how an amount above twenty mithqals is assessed.
The first threshold is twenty mithqals. The second question concerns increments of four mithqals, qirats, and differences among the jurists.
The original nisab and the later increment are separate measures.
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Zakat on Gold: Nisab, Incremental Dues and Jewelry
Two questions must be distinguished: when gold zakat first becomes due, and how an amount above twenty mithqals is assessed.
The first threshold is twenty mithqals. The second question concerns increments of four mithqals, qirats, and differences among the jurists.
The original nisab and the later increment are separate measures.