Asta Bidspirit | A gorgeous and highly collectable,

A gorgeous and highly collectable, large (30.6 carats), BLUE OPAL cabochon from Lightning Ridge, New South Wales, Australia. Good iridescence with predominant blue and green hues throughout. This specimen originates from the Griman Creek Formation of Cenomanian-Late Cretaceous age (approximately 100 million years old).Dimensions: 24 x 21 x 12 mm.