Every season there's a trending colour that's everywhere you turn, rather like the notorious reign of 'Butter Yellow' in 2025, which was hugely celebrated by many. Princess Kate wearing AquamarineThe Princess of Wales actually sported the almost Tiffany-box blue tone long before many celebrities did. Princess Kate during Trooping the Colour 2025Back in June 2025, the mother of Prince George, Princess Charlotte and Prince Louis stepped out in the daring shade at Trooping the Colour. © Getty Images Kate cut a striking figure in her aquamarine ensembleThe Princess wore her hair in a sophisticated updo, finished with a complementing floral hat in the same eye-catching blue. Queen Letizia's aquamarine dress of dreamsIt's not just Kate who has coveted this colour.