Director of the South Australian Museum Brian Oldman holds The Virgin Rainbow Opal ahead of Camilla, Duchess of Cornwall's viewing of a selection of opals from the South Australian Museum Opal Exhibition at Government House in Adelaide, Australia, 10 November 2015. The royal couple are on a 12-day tour visiting seven regions in New Zealand and three states and one territory in Australia. (Photo by Tracey Nearmy/EPA)
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