This Lightning Ridge Opal Cabochon measures 7x17x3mm and weighs 3.5 Ct. It is a natural Australian opal with a polished cabochon shape in a stunning blue color. The gemstone has not been enhanced and is a one-of-a-kind piece that will make a great addition to any loose gemstone or jewelry collection. The opal was mined in Australia and is accompanied by its country of origin certificate.