145.6 ct - Top Colors - Huge Crystal Opal Rough - See Video- 29.12 g

Crystal opal is renowned for its captivating play-of-color, displaying iridescent flashes of multiple hues against a translucent to transparent background. A large crystal opal rough of significant carat weight showcases the gem's intense colors — often including bright reds, blues, greens, and purples — that shift and shimmer as the viewing angle changes. Opal is a hydrous silica-based gemstone formed through a unique geological process involving water carrying silica deposits into cracks and cavities in rocks over millions of years. This rare raw form is prized not only for its potential as a cut gemstone but also as a collector's specimen due to the vivid natural colors and the fascinating internal structure that diffuses light to create the fire-like effect.