Much enjoyed this Beth. Mary, Dss of Gloucester was Geo III & Queen Charlotte's last surviving child. Her collections included items inherited from her mother and her childless sisters. Most of these were bequeathed to her nieces and nephews. Jane, Lady Roberts (former Royal Librarian and wife of Hugh Roberts) wrote: "
Together with several items of jewellery Princess Mary Adelaide of Cambridge....received the amethyst box which had been Princess Sophia's". Mary Adelaide's daughter Queen Mary (who later became the owner of Mary Gloucester's pearl & diamond stomacher) had a great passion for collecting objects connected to Queen Charlotte and purchased a large number of such items as they became available. She also received many as gifts from friends and family. One from Lady Mount Stephens was Queen Charlotte's note book with its case of tortoiseshell, gold, and diamonds.
https://www.rct.uk/collection/46707/queen-charlottes-notebook Queen Mary never lost interest even in old age, and in 1951 two years before her death purchased from George 2nd Marquess of Cambridge (her nephew), Queen Charlotte's Jewel Cabinet which had been owned by Pss Mary Dss of Gloucester and passed down to Pss Mary Adelaide. See RCT article link below and also YouTube video where its interesting to see how Queen Charlotte's jewels were secured in 1762. Notice the compartment where her very valuable diamond stomacher was stored.
https://www.rct.uk/collection/themes/publications/george-iii-and-queen-charlotte/jewel-cabinet