I agree that it is unlikely that Queen Victoria ever had the Arcots.
But I would think the decision to put them up for sale must have been taken during the reign of William IV, when it was well understood by the Royal Family and the Court that, on his death, the crowns would be divided and all property would need to be identified and divided too.
I would think it was William IV, encouraged by Queen Adelaide, who took the opportunity to resolve the fate of the Arcots in his Will, and honour Queen Charlotte's wishes. If so, then his executors would have sent the Arcots for sale.
Of course in all this we have not yet considered what the Will of George IV might have covered.
--Previous Message-- : Judging by the time frame, in that the : diamonds were sold exactly a month after : Queen Victoria's accession. It seems likely : that she never had possession of them, and : that William IV's Will must have expressly : ordered that the Arcot diamonds, should be : sold in compliance with his mother's wishes, : instead of passing to Queen Victoria. : : Thus I would say that Queen Victoria never : wore, nor owned the Arcots; owing to the : fact that it was only a month's delay from : William IV's death to their sale. : : They must have passed into the hands of : lawyers who decided to sell them in : compliance with Queen Charlotte's Will : and/or William IV's. :