Most of the time boulder opal is cut so the fiery opal is visible in thin veins running across the stone… but sometimes the veins of opal are wide enough that they can be split down the middle, leaving a thin sheet of opal layered over the rich brown matrix.   

This is one of those, and the photos really don’t do it justice - most of the fire is purple or an electric blue, but there are also flashes of green and at some angles the purple looks almost pink. It’s a really spectacular stone, and I set it with a scattering of tiny moonstones as accents - there isn’t a ton of flash in the moonstones, but when they do light up, it’s a bright blue that mirrors the blue flash of the opal.