Part of the Andreous' opal find, including rare Yowah nuts and Koroit matrix opal. Image credit: Daily Mail

Sofia Andreou, opal retailer

The group who discovered the opal deposit near Yowah: (from left) David Darby, Isaac Andreou, Chris Daff, and Sofia Andreou. Image credit: Discovery Channel

A rare Koroit matrix opal, found by the Andreous' group. Image credit: Daily Mail