Princess Diana

The diamond encrusted necklace was gifted to her by Dodi Fayed in 1997 but Diana never got to see the finished set due to her tragic death.

The late Princess of Wales was a pupil at the preparatory school from the age of nine to 12 in the 1970s.

The letters were privately owned for 25 years by two of her friends and document Diana's feelings during the last two years of her life.