Boulder Opal

Boulder opal forms in Queensland, Australia, in thin seams within ancient ironstone bedrock. Unlike white or black opal, it cannot be separated from its host — the dark brown ironstone is part of the finished stone. Over millions of years, silica-rich water seeped into fractures in the rock and deposited microscopic silica spheres. When stacked in regular arrays these spheres diffract white light into the full visible spectrum: the play-of-color. Each boulder opal carries a piece of the landscape that made it.

The color sits against dark ironstone like fire in a rock face: vivid, sudden, absolutely itself. No two are identical. It is a stone for people drawn to the real thing — beauty that includes the rough, the irregular, the unprocessed. Wear it any day, all seasons. It needs no occasion to justify itself.