Collection: All Opal Gemstones - Boulder Opal - Cabochon

Real natural Boulder Opal Gemstones, certified to be real, natural of origin, and as described.
Boulder opals are easily distinguished by their layer of solid brown ironstone left on the back of the stone. Boulder opals, as the name suggests, are mined from large ironstone boulders under the ground. Thin veins of colourful opal forms in cracks and fissures in these boulders.
At natural Gems Belgium we sell boulder Opals of all types, sizes and colors that are or certified by Gemmologists, laboratory, or by Natural Gems Belgium.
If you buy  a boulder opal at Natural Gems Belgium, you are sure to get the Natural Boulder Opal as described, alsways with report or certificate.