The price seems low. As in, "be careful whether or not these are real" low. In comparison, Sarah from Kojima is offering this strand on her website:
https://kojimapearl.com/collections.../sea-of-cortez-pearls-national-grade-necklace
This is a price drop too. For a long time it was listed at 29k iirc. Granted, the size is bigger and the quality is likely higher, but strands of these pearls are rare.
ETA: Oh, I see they are on Diamond Bistro rather than eBay (like I initially thought). Probably much more legit then. (with eBay, you're always having to be on alert to people selling cheap dyed Chinese freshwater pearls as more expensive salt water offerings).
I've admired the Kojima necklace forever.. Thanks for posting it here...saved me the search!