Stunning 80ct untreated Australian Boulder Opal

This stunning opal has rich swirling earth tones with veins of blue opal crystal that flashes violet and blue, and a glistening liquid luster that shines across its smooth polished surface. It has an oval cabochon cut and measures 37mm x 30mm x 10mm. Sourced from the Koroit opal fields in the Paroo shire of southwest Australia. Untreated!