boulder opal

Boulder opal is a unique gemstone formed within ironstone rock in Australia, showcasing vibrant, iridescent colors. Its beauty comes from thin layers of opal embedded in the host rock, creating a striking contrast. Unlike solid opal, boulder opal retains some of the surrounding stone, making each piece one-of-a-kind. The play of colors — caused by tiny silica spheres — can include bright blues, greens, reds, and other hues. Valued for its natural appearance and stunning fluorescence, boulder opal is popular in jewelry and collectors' pieces due to its durability and unique patterning.