What do you mean with re-arranged items from the Mellerio Sapphire Parure?
The Diadem has been re-set for April 30th (Investiture), the collier was set on a frame and worn as a diadem (Princess Máxima in Copenhagen), the two bracelets are intact as we have seen on April 30th (worn by Princess Beatrix), so there are no sapphires and diamonds left to create this new collier.
It looked real but also very contemporary to me. I am sure it has nothing to do with the 19th C Mellerio Parure or the 1901 Wedding Gift Parure.