Duchess wore Cartier Trinity Tri-Ring Necklace in Paris in March 2017. Designed by Louis Cartier in 1924, the Trinity ring is a signature design of the Cartier Maison. The three interlaced bands in pink, yellow and white gold symbolize love, fidelity and friendship. The ring has inspired the full Trinity collection, a timeless testament to life’s most memorable loves. The necklace is available for GBP 1480.00.