I am pretty sure those are keshi pearls, though quite large. The gem labs around the world started seeing these large keshi passed as "natural or wild" pearls several years ago, but trips to the lab say they are keshi. Our own Dr Tom had a bunch of those a few years ago that he bought as natural, but the lab said they were keshi, Pattye bought two of them.
I think the price is pretty high for uncertified pearls.-either because it is a scam or because the dealers just don't know. You should only buy uncertifed pearls from known pearl experts like Jeremy Norris . i forget his webpage url.
Examples like this are why non-experts should only buy certified natural pearls- because every kind of scam possible has happened with people calling cultured pearls of every kind, "natural"