Ok here we go best my cam can do.. i have pile loose ones i tryed to break some with teeth couldnt and their no flacky pieces in box in hole of some peals is dirt 2 other necklaces i didnt post were shedding a layer of so i been through them all under a magnifine and these didnt flake
My sole impression is that these are imitation pearls. The stones in the clasp look like rhinestones.
If you can spare one small pearl to test, if you wipe it with nail polish remover, a real pearl will not be damaged but an imitation pearl will lose its fake pearl coating, leaving the glass bead.