Natural Ethiopian Welo Fire Opal 9.8 Carat Cabochon   
Natural Opal Origin Wello, Ethiopia
Grade Top AAA Cut/Shape Cabochon
Weight: 9.8  Carat
Size: 20.5mm X 13.3mm X 7.1 mm
The cut of a fine opal should be symmetrical. If it's a cabochon, the dome should be well rounded. Domed surfaces give the best play-of-color, and make the stone appear vivid from most viewing angles. If the cabochon is flat, it might be vulnerable to breakage, especially during setting into jewelry.