Pearl identification by blemishes

[Polforos]

Hello! Since my father kindly agreed to make a little photosession of the necklace I am not sure about, I finally decided to ask! Ovals are a common shape for several types of pearls, so I mostly looked for blemishes and luster. The last one is not dull, I would say quite good, but not as excellent as my silver white SSP. And the blemishes strike me odd, because soft circles and pin pricks look like saltwater thing, while some discolorates circles remind me of FWP. Also, the blemish in the form of check mark is unusual to me.

Here it is with different light sources, my photos, obviously, at the end:
What do you think they are?