These small organic and free form natural Australian Boulder opal stud earrings are rustic and beautiful! They feature raw flashy nuggets of Australian Boulder opal on a prong set sterling silver stud back. These are solid natural Australian boulder opal from Queensland, and as such each stone is one of a kind. Boulder opals are cut from ironstone boulders where opal has formed in cracks and fissures. The deep color of the ironstone leads to vibrant play of color in the boulder opals. Note - these nuggets are very organic and do not exactly match. Sublime!