It would be interesting to know what jewels were to make the tour if it had proceeded in 1952. Since Granny was alive and Elizabeth was a princess, obviously much less. But one would think the Girls of Great Britain and Ireland tiara went along, and a nice diamond necklace or two. We know the flame lily brooch was with her, since she wore it when she returned to England.
By 1953-54, the Queen was living for six months in her southern Commonwealth countries, and she took much that she would have worn at home. With a ship and a royal train for travel, her property (some of it held for all queens) could be kept safe.
The diamond diadem did not leave Britain. I wonder whether the wedding to which Queen Mary wore it in Berlin was its only journey abroad. The Delhi Durbar tiara also stayed home, perhaps because of its Empire associations. The tiaras and major necklaces the Queen wore were personal jewels rather than official ones. The coronation necklace suggested her official role as monarch, along with the coronation gown.
Were there by then Australian and New Zealand brooches in the Queen's collection? She no doubt received some along the way.