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There is a lot of face color on this Koroit boulder opal. It's a fairly large stone at 30.4mm x 17.3mm x 5.4mm and 17.11ct. It's hand carved undulating surface follows the natural opal seam and the sides are cut into this interesting quadrilateral shape. It's a 100% natural stone with no treatment of any kind. It would be a great stone for any art jewelry project, It could be a pendent stone or even a large ring stone. Boulder opals with this much face color are very rare.