Wikipedia
State crown
A state crown is the working crown worn by a monarch on recurring state occasions such as State Openings of Parliament, as opposed to the coronation crown with which they would be formally crowned. Some state crowns might however be used during parts of the coronation ceremony. In isolated cases, individual monarchs sometimes chose to use their state crown instead of the official coronation crown for the crowning, but those cases were exceptions rather than the norm.
Some states where there was no ceremonial coronation only had state crowns, or neither as in Belgium.
Usage examples of "state crown".
She was dressed in the royal robes she had worn at die Zinoran coronation and had the magnificent State Crown of Ruwenda upon her golden hair.