Wow! On the same site as the C64 tie you can find these black eye cufflinks that look great! At least on the photo They’re called black cat´s eyes, though although they might be eye catching, I shouldn’t imagine the designers had road safety in mind…

€21.90 from Ulterior Motive

These solid and elegant cufflinks are made of titanium, crossed with four silver bands and finished with a small CZ stone (cubic zirconium, a commonly-used synthetic diamond).

£83.99 from The Beautiful Company