Mary Victoria Curzon, Baroness Curzon of Kedleston, Vicereine of India (born Mary Leiter) wears a diamond and pearl tiara with a colored central gemstone in an official portrait, ca. 1901; read more about the jewels dispersed in her will over here!

Consuelo Spencer-Churchill, Duchess of Marlborough (born Consuelo Vanderbilt; later Consuelo Balsan) wears her diamond tiara from Boucheron with a coronet for the coronation festivities of King Edward VII of the United Kingdom, 1902; read about the tiara’s story over here!

Rose Fitzgerald Kennedy, wife of Ambassador Joseph Kennedy and mother of President John F. Kennedy, wears a Chaumet-made diamond tiara borrowed from the Countess of Bessborough for presentation at court, May 1938; see Lady Bessborough wearing her tiara over here!