And in case you were wondering why this particular jewellery set looks very familiar, it actually matches her engagement ring formerly owned by Princess Diana.
It's believed the late princess owned the full set, which Kate has now presumably inherited.
Last week, Duchess Catherine and Prince William showed their outward support for Ukraine by visiting the Ukrainian Cultural Centre in London. Again, Kate opted for a bright blue jersey, the colour of Ukraine's flag. The royal couple also brought along homemade brownies and granola bars for the volunteers there.
Following Monday's Commonwealth Day Service, Kate and William issued a joint statement to Twitter, writing: "Fantastic to come together to celebrate #CommonwealthDay and modern, vibrant and diverse communities across the globe at Westminster Abbey today."
The service was also attended by Prince Charles and Duchess Camilla, though in a very rare move, Queen Elizabeth II opted out of this year's event due to safety and health reasons. She is currently residing in Windsor after recovering from COVID-19 in February.
Reunited or not, there's no doubt Commonwealth Day provides a spectacular royal-watching opportunity—and Kate certainly saw to that.