The upcoming coronation of King Charles and Queen Camilla is causing a stir.

Kate Middleton, however, may not wear a tiara.

This is surprising because royal women typically wear bejeweled toppers.

King Charles and Queen Camilla, on the other hand, will wear historic headpieces.

Queen Camilla will even wear Queen Mary's Crown, which is being reused.

King Charles, meanwhile, will wear the Imperial State Crown.

The ceremony itself will be more modest than Queen Elizabeth's, but more inclusive with representatives of different religions.

Even Lauren Kiehna, a jewelry expert, is uncertain about the tiara situation.

So the question remains: what will Kate wear to the coronation?