All eyes were on the beautiful Queen Mary of Denmark when she celebrated King Carl Gustaf of Sweden’s 80th birthday at Stockholm’s Royal Palace on Thursday night. Looking resplendent in a Japanese-inspired purple floral dress with a keyhole neckline, the 54-year-old royal accessorised to perfection with glittering silver drop earrings and a beautiful tiara as she went arm-in-arm with her husband King Frederick X. © Getty ImagesQueen Mary of Denmark celebrated King Carl Gustaf of Sweden’s 80th birthday at Stockholm this week Upon closer inspection, however, the queen’s statement headpiece was actually a historic bracelet from the Danish Royal Property Trust. The DIY tiara was crafted from a diamond floral bracelet that previously belonged to Queen Louise of Sweden. The sentimental item boasts a rich history; it was originally given as a wedding gift by King Oscar I and Queen Josephine of Sweden to the future Queen Louise in 1850. The piece was most recently sported by Queen Margrethe II of Denmark, who abdicated the throne in 2024. Margrethe was often pictured wearing the special …