The independent gold nisab is twenty mithqals, with half a mithqal due after the relevant year.
Every additional full four mithqals adds two qirats under Abu Hanifa’s step-based rule; the companions assess every excess proportionately.
Bullion, jewelry and vessels made from gold or silver remain zakatable under the Hanafi rule. The Shafi‘i exemption for permissible personal-use jewelry is a separate disagreement.