I was quite surprised, these are questionable at best.  I have a large collection of Tahitian black pearls, and when I compared them to these earrings, the earrings just looked fake.  The luster is poor and they look far more gray than the deep green/black that authentic Tahitian pearls look like.  As marked, they are from China, and not from a reputable dealer. A letter of authenticity would have made me feel a little bit better, but I would have returned them either way due to the poor quality of the pearls.

With all that said, major Kudos to Amazon for making the return quick and easy.