Before everyone goes on the offensive toward moonriverpearls.com I would like to point a few things out. While Michael is 100% correct about black freshwater pearls, I think it may not be 100% intentional on the part moon river pearls.
It is true that although natural color black freshwater pearls do not exist, except maybe by a rare fluke but never enough to market, they are still sold by many vendors as natural black freshwater pearls.
The reason I mention this is because I am thinking back to the time when I first got into the pearl business. I was dealing with a supplier in China that I (mistakenly) trusted implicitly. This 'trader' had a myriad of different color freshwater and Akoya pearls alike. I knew that the freshwater pearls were treated, but I also knew that it was possible to produce black saltwater pearls, albeit only Tahitian. The supplier I dealt with priced two different lots of Akoya pearls for me, one was supposedly a natural black, and the other a color treated black. I chose the natural black - of course. It was not until I returned with my purchase to the US that I learned that those pearls were, of course, treated as well.
Basically what I am saying is we should give Moon River Pearls the benefit of the doubt. By looking at their product it is most likely that the fabrication of the individual pieces occurs in China. This means they are dealing with a 'trader' like one of those at Hongqiao pearl market. It is also likely that this 'trader' has given them misinformation that they have taken as fact without independent research. Thus, it may not be that they are intentionally being dishonest, they may just be misinformed.
I would invite comment from Moon River Pearls as I can see from a link on their Site to Pearl-Guide.com, they do know about this forum. Maybe we can convince them of the truth without resorting to formal complaints with the FCC or the JVC.