Evolution of Cybermen
I think they missed a stage – the eighties cybermen with the v-shape chest units, which are the ones I remember since I was born in the eighties.
Admittedly the writing had gotten a little silly by then. The whole thing about gold being lethal to cybermen was, as I understand it, really just referring to gold dust as it was non-corrosive and therefore could clog their systems or some such thing. But by Silver Nemesis they’re just being killed with gold arrows, and even gold coins fired from a slingshot.