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While on the subject of the sapphire Bismarck, I wondered if the gift of the large sapphire to the late PD PoW from the late QEQM could have been the reported gift to the late QEQM by her husband on their coronation day? I read somewhere that the QEQM was gifted a large sapphire either by her husband or the Emperor of Japan. I can't recall if I may have seen it on another jewel board, but I also read HM QE may have also been gifted by the Emperor of Japan a massive sapphire as well. Could anyone on here say what is the true carrot weight of the sapphire worn by the late PD PoW? And maybe able to indicate it's provenance i.e. whether it was the said sapphire gifted to the late QEQM by her husband? Is it possible it came from the Greville bequest?