Well, I'm not a woman, but I have seen the freshadama in person side-by-side with hanadama akoya (which are the very best of the akoya). They are truly world-class pearls. In one of the other threads started by a guy buying a gift for his girlfriend, he said that he had them appraised and the appraisal value was about $4000, I think.

If you absolutely insist on spending lots of money (which you most certainly will if you shop at Mikimoto), get a strand of the largest available freshadama. Or consider getting a multi-strand of the smaller size. Either of those should provide the necessary "wow" factor.