After having seen this I suspect that we will have to get used to an era of boredom jewelwise when it comes to the Queens choises.

1. The tiara demands a higher hairdo or else the pearls will just fall to the sides as one can see on the photos. The tiara will not be displayed properly otherwise. Queen Mary does not usually have high hairdos.

2. The dress leaves her with no other choise than to use the diamond necklace which is a bit sad it being her first incoming statevisit. Maybe a dress with space for a more prominent set of jewels would have been in place.