- The first tiara she wore as HRH was the Durbar in October 2005 for the Norwegian State Visit. - The same year in November she wore the Shand tiara for the diplomatic corps reception. - Then she debuted the honeycomb tiara in June 2006 at the SV from Brazil. - In November 2007 she wore the Shand tiara again for the diplomatic corps reception in November 2007.
Unfortunately, there have been no pictures from other diplomatic receptions. So it's possible that the Duchess wore her Shand tiara more often. Or she might even have worn the Teck tiara, as we know from Roberts, that this one is also loaned to her. - Can we bribe some diplomats to smuggle in their camera?