Awesome 8.25ct untreated Australian Boulder Opal

This opal has rich swirling earth tones paired with ample opal crystal, and a glistening liquid luster that shines across its smooth polished surface. It has a free form cabochon cut, and meaures 19.7mm x 14.1mm x 4.6mm making it perfect for setting. Sourced from Australia. Unheated.