'Moonlight at the Shore' Opalized Petrified Wood Necklace - Natural Designer GemstoneOpalized Petrified Wood is a remarkable geological formation where the original wood has been substituted by opal, a hydrated silica mineral. Known as "wood opal," this material retains the woods organic patterns despite the transformation. Unlike typical petrified wood, the opalization process can introduce hues like blue, creating a distinct appearance. Classified as a fossil, this wood dates back to the Miocene era, approximately 20 million years