Shall we call this an 'S' shape .. or a 'Z' shape ?!? Anyway, it's wavy, has strong character and too rare to see a piece of boulder opal like this, not sure how the design could be introduced. We love it for how it comes naturally. This natural Australian boulder opal loose found from Quilpie, Queensland, Australia
Describes the arrangement of opal's play of colour. Please see Learn About Opal to understand more.