Black and gold work because the dark background makes gold shine. The pair is linked to luxury, nightlife and celebrations. The contrast between matte and shiny gives it real impact.
Use black as the base and gold only for details, around 80-20 or less. In fashion, a black dress or suit with gold jewelry, buttons or shoes is a classic. At home, black furniture with gold handles, lamps or frames looks elegant. Go easy on the gold: less is more.
Contrast between them: 9.0:1. Enough to put text in one color on the other.
Yes, it is a favorite for New Year's Eve, birthdays and galas. Add white so it does not feel too dark.
Yes, for example with black cabinets and gold faucets or pulls. It works best with good light and some wood or white.