Princess Margaret of the United Kingdom wears the Cartier Halo Tiara with her coronet (and her mother, Queen Elizabeth, wears her crown without its arches) during the coronation of her sister, Queen Elizabeth II, at Westminster Abbey, June 1953; more on the tiara here and the crown here!

Elizabeth Harcourt, Viscountess Harcourt wears the family’s nineteenth-century diamond tiara with her coronet for the coronation of Queen Elizabeth II at Westminster Abbey, June 1953; the tiara, which was convertible for wear as a necklace, was sold at Christie’s in 2019

Mary Elphinstone, Lady Elphinstone wears the Lotus Flower Tiara with her coronet for the coronation of her brother-in-law and sister, King George VI and Queen Elizabeth, in Westminster Abbey, May 1937; more on the tiara, which was a loan from her sister, over here!