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LONDON, UNITED KINGDOM - NOVEMBER 24: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Sophie, Countess of Wessex visits the Exhibition of Opals by John Adie at Buck's Club on November 24, 2016 in London, England. (Photo by Max Mumby/Indigo/Getty Images)

LONDON, UNITED KINGDOM - NOVEMBER 24: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Sophie, Countess of Wessex visits the Exhibition of Opals by John Adie at Buck's Club on November 24, 2016 in London, England. (Photo by Max Mumby/Indigo/Getty Images)

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LONDON, UNITED KINGDOM - NOVEMBER 24: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Sophie, Countess of Wessex and Prince Edward, Earl of Wessex visit the Exhibition of Opals by John Adie at Buck's Club on November 24, 2016 in London, England. (Photo by Max Mumby/Indigo/Getty Images)

LONDON, UNITED KINGDOM - NOVEMBER 24: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Sophie, Countess of Wessex and Prince Edward, Earl of Wessex visit the Exhibition of Opals by John Adie at Buck's Club on November 24, 2016 in London, England. (Photo by Max Mumby/Indigo/Getty Images)

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LONDON, UNITED KINGDOM - NOVEMBER 24: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Sophie, Countess of Wessex and Prince Edward, Earl of Wessex visit the Exhibition of Opals by John Adie at Buck's Club on November 24, 2016 in London, England. (Photo by Max Mumby/Indigo/Getty Images)

LONDON, UNITED KINGDOM - NOVEMBER 24: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Sophie, Countess of Wessex and Prince Edward, Earl of Wessex visit the Exhibition of Opals by John Adie at Buck's Club on November 24, 2016 in London, England. (Photo by Max Mumby/Indigo/Getty Images)