Akoya pearls, South Sea pearls, Tahitian pearls, saltwater and freshwater pearls, white pearls, pink pearls, black pearls and gray pearls. Our display cases offer more types of cultured pearls than ever before, which is terrific — there are pearls to suit every taste and budget —but the sheer number of choices can be daunting to the uninitiated pearl shopper.

No worries. The following is a primer o...