And for the banquet, a dose of aquamarine!
To finish out the trip, she waved farewell to the President and First Lady wearing what I believe is the Pearl Trefoil Brooch.
The state visit coincided with the G-20 London Summit, which brought President Calderón to town in the first place.
hugged Her Maj (well, sort of), which seemed to bother a whole lot of people who aren't HM and didn't seem to bother HM at all. As tends to be the case.