Well, what I think I see is a well matched, strand of bead nucleated (cultured) freshwater pearls. These were bleached to a very light color, in my estimation, they appear over bleached in some photos, which might have affected the luster.
The slight graduation in size 9.6-10.85mm, if accurate, indicates genuine pearls to me, the slight off roundness of some pearls, too. Imitation pearls probably wouldn't have this graduation and would be closer to even millimeter size, 9.0, 10.0, 11.0. On the pearls that show the edge of the drill hole, the edge is sharply defined, not rounded as most coated pearls show.
Pearls are graded and matched by experts without using magnification, so when we, in our curiosity, check with a loupe or other means, we are going to notice the light blemishing, surface imperfections and such, not seen with the naked eye. I do wish I had a microscope, but for me 10X and 20X loupes have to do. A "dent" in a round pearl is often where the drill hole will be positioned.
The original price for the necklace would seem to be in line for a Yurman piece with genuine fw pearls, but not SS pearls.
This is just my opinion, of course. So the question would seem to be, do you like them enough and pay little enough to wear and enjoy them as they are?