Lightening Ridge, New South Wales, AustraliaA free-form opalized clam shell with a strong play-of-color of green, blue, and electric violet. Contour polished on both the dome and the underside to reveal the play-of-color and high degree of translucency. The majority of opalized fossils originate from Coober Pedy, Australia and rarely from the locality of Lightning Ridge as is the case with the present gem-quality specimen. Weighing approximately 36.43 carats and measuring 29.63 x 22.17 x 10.39mm