|The Duchess of Cambridge wears the Cartier Halo Tiara on her wedding day (Fiona Hanson - WPA Pool/Getty Images)|
|The Cartier Halo Tiara is displayed at Buckingham Palace (Lewis Whyld/WPA Pool/ Getty Images)|
|Princess Margaret wears the Cartier Halo Tiara to the Royal Opera House at Covent Garden on the eve of the coronation; beside her, the Queen Mother wears the Oriental Circlet with the Crown Rubies (British Pathe screencap)|
|Princess Anne wears the Cartier Halo Tiara in New Zealand in 1970 (William Lovelace/Daily Express/Getty Images)|
|The Duchess of Cambridge wears the Cartier Halo Tiara on her wedding day (BEN STANSALL/AFP/Getty Images)|
Note: This is an updated version of an earlier post, with new text and images.