These are a ladies variation on the standard gent’s Gold window cufflinks.
The bodies are silver and the gold is 18ct sheet that is pressed into the silver and given a reticulated surface. (Reticulation is a term that comes from the greek word for ‘net’ and it’s a sort of crinkly texture.)
There seem to be precious few cufflinks out there that are designed specifically for women and these have been very popular as a result. There’s also the added benefit of having matching earrings.