Lot 51. 21.77 carats Crystal Opal with Multi-Color Fire, Lightning Ridge, New South Wales, Australia. Estimate US$ 35,000 - 45,000 (€ 35,000 - 44,000). © Bonhams

A large oval cabochon crystal opal with slight potch to the underside having a rolling flash play-of-color dominated by bright reddish orange and a full array of hues. Weighing approximately 21.77 carats and measuring 26.5 x 16.3 x 7.5mm.

Bonhams. The World of Gold, Opals and Other Phenomenal Gems, Los Angeles, 30 June 2020, 10:00 PDT