From publisher blurb:
Iridescent blue pearls highly desired for their unique color and rumored to have magical properties have become much more common over the past few years. Rumors trace their source to a merchant in a seacoast village. Other rumors tell of a wild witch that lives in a cave by the sea and conjures the pearls from the cliffs themselves.
The Blue Pearl Grotto is the source of these naturally-occurring, rare, blue pearls. Katelyn Blauvulf is a reclusive merchant that sells the pearls. She is also a sorceress that cultivates the oysters in the grotto. Friendly, but fiercely protective of the source of the pearls, the secrets of the grotto belong only to her, at least for now.