I have black pearl studs, white pearl studs, and an incredibly gorgeous black pearl ring with four diamonds on either side of the pearl. On Saturday my DH bought me a black pearl and diamond pendant. All are Mikimoto.
I have another pearl necklace that isn't a brand name, but the pearls are the real deal. As pretty as they are, I prefer Mikimoto. There's a certain comfort level I get by knowing exactly what I'm wearing.