A couple of things I noticed:
1) although the seller tells you in the FAQ section that black and turquoise are not natural colors, nowhere did I see a statement that some of the pearls are dyed. That's a dicey tactic.
2) I didn't see anywhere that "you will receive the item pictured". Period. You could contact seller and ask for pictures of the exact item - I doubt you will get one.
This is just more of the same as you've already dealt with. Don't bother. I think you could end up with worse than you've got now, easily. It's hard to give up the idea that you can get wonderful pearls dirt cheap, but in reality you'll waste money if you keep hoping for it. Take your time, read some more, save up some money and do business with some of the posters here. I'm not a vendor here or anywhere,BTW, I'm just another person who got wise after wasting money.
P.S. your $78 is a good start towards something nice. Double or triple it (or more if you want extreme delight, which I would recommend) and deal with the vendors that post here and you'll still be getting a steal, comparatively, without a doubt.