Oh, your earrings have arrived! The luster looks outstanding! This is a large purchase and it sounds like you are disappointed. Yes, the rose' tint is traditional for Mikimoto earrings. They go through bleaching and then a "pinking" process, before being matched and drilled. If you were shopping in person, you might notice slight differences in the overall color from one pair of earrings to another. This is an accepted, known treatment for almost all Akoya pearls produced and sold all over the world. I first learned about this process here on the forum. It doesn't cause damage to the pearls.
Pearl Paradise is one company (in California) I know that carries top-quality "natural white"
Akoya. Jeremy, the owner, started this forum!
Some find that when the earrings are worn the slight pink color compliments one's complexion. Are you able to return or exchange the earrings? Perhaps chatting with a Kennedy Sales Associate would be helpful.