I thought it might be useful to repeat here some extracts from notes I have which refer to Queen Adelaide, when posted in the past about the Hanoverian claim on jewels. I think these extracts demonstrate how complex is the history of those diamonds.
1830 - George IV died and was succeeded by his brother William IV.
1831 - The new King's consort, Queen Adelaide, required Rundell's to remove brilliants from Queen Charlotte's great stomacher to embellish her coronation Crown. After the ceremony the diamonds were transferred to her new circlet, the Grand or Regal Diadem with a crest of alternating crosses-pattée and fleur-de-lis. The point of the stomacher, untouched, was retained with the dismantled setting in the original case.
Queen Charlotte had engraved details on brass plates on the fitted boxes for her jewels.
Queen Adelaide made it plain that some of the articles listed on the brass plates attached to Queen Charlotte's jewel boxes were missing when the cases passed to her in 1830.
1839-1841 - A bill was filed in Chancery on behalf of the King of Hanover against William IV's executors making a claim under two heads the 'Antient Hanoverian Jewels' bequeathed by George II to the Electorate, and jewellery bequeathed by Queen Caroline to Hanover. Matters proceeded with various people providing depositions and statements.
Evidence from Rundell's made it clear they kept record of the most important stones when transferred from one piece to another.
The Claim period started in 1837 when the new King of Hanover, Victoria's eldest living uncle, Ernest Augustus Duke of Cumberland, "was soon known to be planning to claim the Crown Jewels."
When Queen Adelaide was about to hand them over to her husband's executors for delivery to the Lord Chamberlain, she separated the English jewels from the 'large portion' of pieces bequeathed by Queen Charlotte to Hanover. Ernest Augustus' claim to his mother's jewellery was signified in a letter of 8 November 1837 to one of Queen Charlotte's executors.
I have quoted all that because it shows, to my mind anyway, that many adults with serious agendas were dealing in matters barely comprehensible yet to the mere slip of a girl who had just become Queen. End of extracts.