well the company does claim they use natural pearls on some pieces:
http://addapearl.com/natural_pearl.htm
but when they speak of their cultured pearls they do not state which type of cultured pearl they use, which is confusing and makes the natural pearl claim a little less believable.
I'd say if you like the piece and think its worth the money then go for it, but don't get your hopes up that they are actually natural pearls, consider that a bonus if they are.
Better pictures would help for sure.