This is a spectacular example of Lightning Ridge Opal from Australia. This piece is quite large coming in at 139.05 Carats and measuring 50x42x21 mm. The stunning ultraviolet blue shifts and gives way to purple depending on the ambient lighting. This large specimen can be kept as is which would be an amazing addition to a fantastic collection. It could also be carved into a large stunning gem or split up into several smaller ones. The stone is completely natural and untreated. It was sourced in lightning Ridge Australia back in 1973.