Family heirlooms technically belong to the Queen, and so some of Princess Diana's jewellery went back to the crown after her death, which included this set. It is then customary for them to be gifted to other members of the family, such as the Duchess of Cornwall.
She decided to turn the pendant part of the necklace into a brooch, which she was photographed wearing at an event celebrating Prince Charles’ 50th anniversary as Prince of Wales.
In her will, Princess Diana wrote, "I would like to allocate all my jewellery to the share to be held by my sons, so that their wives may, in due course, have it or use it. I leave the exact division of the jewellery to your discretion."
WATCH: Princess Diana Was Once Sent A Surprise Letter By Camilla Parker Bowles.