One of the finest stones I have seen in a long time, and certainly the best chocolate opal I have ever seen. Amazing fire, just watch the video. The cut and polish on this stone is very noce and stones with this coloration and sandstone matrix usualyl do not take a polish, but this one has and is untreated.
Opal - Ethiopian
Multi-Colored over Brown
25mm x 14mm x 7.3mm (long edge is 5.7mm thick)