Why does it matter? For the price, it could be some palatable freshwaters, lacklustre SS or fakes... of all the options, the freshwater one sounds the best to me. The rest, what you see is what you get... at best.
The 1930-40 timing would not warrant calling them 'antique' by the book to begin with (that should be a century or more). However, these guys look 1970-ish or younger, common Indian jewelry. Worth the cash? Why not, if you like them... Wanna make a kill? Don't think so, or at least not with this seller.
All with the usual disclaimer- this is just another uninformed opinion, I don't know any more about those than you do.
On the side, isn't it a shame that no bone-fide 'appraisals' can be made for online jewelry auctions? Knowing what each thing is would kill the flea market spirit, but cure lots of wishful thinking and fraud too
Clearly, no appraiser could stand by his evaluation of a picture (neither do I), but if that is unfair to ask from a professional, how much less fair is to expect any casual shopper to do even better and vote with their cash
FRUSTRATING!