Those are fantastic pearls! I have some 12mm FWs that look more like yours than Pattye's strand does.
If they are freshwaters, they are worth every penny of the thousand dollars. But that bottom left photo passes as Tahitians. If so, you seem to have gotten a mighty rare strand for the money. The color is very rare and the lack of divots, makes it high quality. The other photos, especially the top right one could be freshwaters.
I have started threads before on how well some freshwaters copy Tahitians. This one could be a masterpiece of deception. I think if this were really a Tahitian it would be triple what you paid for it, BUT either way, you made out.
Please let us know any further developments.
And BTW, every word Wendy said about using Tahitian as a name for a color is true! It is entirely unethical.