When Diana divorced Prince Charles in 1996, the tiara went back into Elizabeth’s royal vault. (Some have speculated that Elizabeth gave the tiara to Diana, but according to The New York Times ...

The Strathmore Rose tiara originally belonged to Queen Elizabeth ... The Queen Mother then seemed to send the sparkler into the royal vault and reached for larger tiaras following the unexpected ...

After Anne's last appearance in the tiara, it re-entered Queen Elizabeth's vault and wasn't seen again until 2011, where it became the training-tiara once again for a future queen, Kate.

The tiaras came out of the royal vault for the state banquet in honor of Japan's Emperor Naruhito and Empress Masako. While Queen Camilla opted for the Burmese Ruby Tiara, Sophie, Duchess of ...