That's very possible, Gill, and Diana wore at least one of the Saudi necklaces and the emerald choker. However, the choice would have been restricted to necklaces that are not designated for the queen (i.e. the jubilee and the historic pearls). I wonder whether pieces like the sapphire or aquamarine necklaces that belong to sets the Queen owns personally would be included. What would then be available other than the Nizam?