The composition, provenance, and appearance of Ethiopian opal and Australian opals differ greatly, despite the fact that both are valued for their striking color display. Australian opals, valued for their stability and bright, intense colors, are found mostly in Coober Pedy and Lightning Ridge. The Welo region is home to Ethiopian opals, which are hydrophane, meaning they absorb water and can temporarily change their color and transparency. In addition to a greater variety of colors, Ethiopian opals often include bright orange and red flashes.