My list of favorite options:
1. the full House diamond Parure in it's biggest setting
2. the Stuart Tiara
3. Queen Emma's diamond floral tiara with the 5 stars on top and queen Wilhelmina's diamond necklace and earrings
4. the Peacock ruby Parure (tiara, necklace and brooch) with the ruby bracelet of Queen Sophie.
I however expect she'll opt for one of the following:
a. Sapphire tiara, earrings, bracelets and a brooch.
b. Mellerio ruby tiara, earrings, necklace and brooch but not the stomacher.
c. the ornate Pearl tiara and some pearl pieces.
a,b and c are nice but not spectacular.