This beautiful American contra luz opal stone weighs approximately 119.0 carats and measures 46.0 x 44.0 x 10.1mm (1.81 x 1.73 x 0.39 in). It was found in Opal Butte, Oregon. What makes this piece really unique is the brown nebula-like cluster formed inside it. Contra luz opals are similar to crystal opals, which means they are transparent, but have this ability to also create color flash when light passes through from the opposite side.
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