This 2.54kg Opal is the largest Black Opal
“Aurora Australis” (picture and information courtesy of Altmann & Cherny) The “Aurora Australis” was found in 1938 at Lightning Ridge and is considered the world’s most valuable black opal The oval, cut and polished stone has a harlequin pattern with dominant red, green and blue colors against a black background The rarity of the opal comes …