Blue Peruvian Opal naturally occurs with swirling patterns of deep blues, blue-greens and greens swirled with yellow-green, rust, brown and orange. It is highly prized for its beautiful combinations of colors and for its opalescence — the pearly luster of the opaque stone. Peruvian Opal was considered by the Incas to be a gift from Pachamama, the Inca Goddess of Fruitfulness and Mother Earth.