I had some black speedknobs on my Gibson Les Paul Custom with gold hardware and wanted to replace them for a more vintage look. I tried first the Chrome tophat (PRMK-010), but something was off, it didn't look right.
But those Gibson PRMK-020 are perfect, the gold part is not too strong, so from afar it looks like an old chrome insert and only looks gold in certain angles or at close... perfection for your Black Beauty ;-)