But from the photo - message 2 in this thread - it clearly was not the Iveagh at the Guildhall, so could well have been that one at the Banquet. I lean towards the Princess Louise from the outline in the photo. It looks to have a smooth edge coming to a point. As her gown was dark colours, the sapphire detail in that tiara would look wonderful.
--Previous Message-- : Apparently she wore the Iveagh to the : Guildhall, according to our eyewitnesses, : and I can't imagine she would wear the same : tiara two nights in a row! :