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On Tuesday, the Queen and the Duchess of Cambridge joined forces for a visit to King’s College London.

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The two royal women officially opened Bush House, the latest education and learning facility on the college’s Strand Campus.

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The Queen unveiled a plaque commemorating the royal visit during the official opening.

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For the occasion, HM wore her small diamond cluster brooch with the pink gemstone center. The stone has been variously reported as a pink sapphire or a pink topaz.

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Kate also reached for pink gemstones for the day, wearing her Kiki McDonough hoop earrings with cushion-cut morganite drops.

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Kate wore the same outfit, including the same jewels, later in the day for a visit to the Foundling Museum, where young people are taught to use art in order to make a positive contribution to society. Kensington Palace announced on Tuesday that Kate is the museum’s new royal patron.

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Kate joined in to create some art during her visit to the museum, which also gave us a chance to see her usual trio of rings — her famous engagement ring, her gold wedding band, and her eternity band.