Neptune Crushed Opal

Oceanic

No doubt these are encrusted on Poseidon's Trident. A really subtle, sky/pale blue to start, then a spritely highlighter green takes over the stone. I would consider this to be more of an accent stone since the blue and green are in the same realm. Even though the green is opalescent, it blends warmly with the normal blue of it, and gives it a colorful, happy shine.