AUSTRALIAN BOULDER OPAL CABOCHONS

Boulder opals are a striking variety of precious opal from Queensland, Australia. While Australia is known for its extravagant black precious opals, boulder opal is surely giving it a run for its money. The majority of boulder opals are extracted from a Cretaceous stratigraphic layer in the heart of the Australian continent. Boulder opal is collected from a few small opal fields in the Quilpie, Winton, and Paroo Shires, with a very small deposit in New South Wales.