The Ladies of North Wales first gifted the brooch to the new Queen Alexandra of Denmark when she married King Edward VII in 1863, per The Beau Monde. The main emblem depicts three ostrich feathers surrounding a crown, adorned with the words "Ich Dien," or "I Serve," in German, which came to represent the Prince of Wales. The cabochon emerald is also detachable. Princess Diana last wore the pendant in 1996, the same year she and Prince Charles divorced (via History), and the year before her death.

The Princess of Wales also wore another piece of Princess Diana's jewelry to complete her ensemble during the annual visit: her pearl earrings, known as the Collingwood Pearl Earrings, which were a wedding gift to the late princess from Collingwood Jewelers (via The Court Jeweller). The Princess of Wales frequently wears Princess Diana's jewelry: She subtly honored Princess Diana at the Queen's Trooping the Colour with a piece from her collection, and honored Princess Diana at the British Remembrance Sunday Service.

Of course, being respectful of the past doesn't mean Kate is stuck in it. "The new Princess of Wales appreciates the history associated with this role but will understandably want to look to the future as she creates her own path," a source told People about the royal inheriting Princess Diana's former title.