someone I think on this board,possibly Beth mentioned that QA had been described as wearing a pearl and diamond tiara while Princess of Wales. Someone and it might have been me though I’m not sure conjectured that this tiara might be the pearl festoon, if given by queen mary to marina.

https://mb.boardhost.com/historyroyaljewels/msg/1535179189.html

Edit several people stated that it may have come from QA, I just argued that due to numbers thee must be a third tiara that marina received from QMary