Thanks for your explanation. I can totally see that and thought they looked fake in the photos too. I am not totally convinced they are fake yet, but that seed has been in the back of my mind. If they are fake, I really want to make sure before I send them back and want to know what makes such a good fake.
I shot them in pretty strong backlight yesterday evening so I will try to reshoot them when it isn't so bright. Some of the closeups were shot next to a one of those huge magnifying (lit) desk lamps, which may also have something to do with color. I do see subtle differences in hue as well as imperfections, but they are hard to capture. Some of the pearls are not completely round, but they look pretty good in the photos. I'll try different backgrounds to see if it helps.
Under a high power microscope, the outer layer is similar to my akoyas but the imperfections are a bit different. My akoyas have tiny bumps and ridges set close together. This one has what looks like little lines and a few pricks/bumps scattered a part (not all on a pearl and not all pearls have them). They aren't very pronounced but you can see a few in the closeups in post 16. I tried comparing it to my fws but my dyed black set is hard because of color, the other set has just pin prick imperfections (no scratches, but I have only worn it a few times), but the clean surface is quite similar. I also have mabe pearls and a SSP pendant I can compare the surface to if those would be better choices.
The only place I could tell something was chipping was near the hole (not touching it from what I can tell) on the second pearl next to the clasp (first pic on post 16), so I wondered if removing dried glue could have done that. It is the crater looking thing near the hole and there are fine scratches around it. The string looks new, so it was restrung recently. I can also feel a slight grove where the crater is when I slide my nail through it. If this is fwp, then isn't the nacre in layers? If that chips, will the nacre under it be shiny or just dull? If it is fake, then I would assume a glass bead would be under it, right? Is there a way to tell without breaking the pearl? The other areas where the pearls are scratched don't seem to be peeling. They look more discolored and there is no ridge when I rub my nail over the areas.