Not to bust your chops.
But from I can tell of the photos these cufflinks look to be simple chromed links of essentially no value. I cannot tell anything about the stones. But it would be rare indeed for anyone to have mounted anything of value into a setting of such low quality. Stones of any quality would be mounted in either a silver, silver gilt, or gold mount.
Photos of the backs of the links, including the mechanism would be helpful in terms of dating them. From a style perspective they are probably after 1920 and before 1960.
I would guess they are not worth more than $20, but that's just an old ebay cufflinker's opinion based on a photo, others might think differently.