| This is a very interesting subject, but photos of pearls may lend some help. For instance, you can fully appreciate the Overtone on the pearls in the following photo.
Notice the "halo" effect...it cannot be fully appreciated on this small low-quality photo. Pearls that display at least 3 distinctive (sharp) "rings" or "haloes" are know to have the "Ojo de Pescado" or "Fish's Eye" effect, which made the Sea of Cortez a Legendary Pearl.
Douglas McLaurin
Perlas del Mar de Cortez |