I purchased these pearls in Mindanao. Are they South Sea?

[Tullioz]

I recently purchased this necklace in Mindanao in the Southern Philippines. I was told by the place that I purchased them that they are cultured saltwater South Sea Pearls harvested in Palawan. They were purchased at a Pearl dealer in Davao City. The sizes range from 9.5 to 10.5mm. Since the people on this board seem very knowledgeable I decided to seek opinions from here. Do these appear to be the real thing? I tried to do the best I could with the pictures and I know it is probably difficult without actually physically inspecting them but thought I would ask. If the pictures are not enough to tell from, what should I look for to tell if they are? Thanks in advance.