The base of the Coronet is of the same design as those of the Imperial State Crown and St Edward's Crown. It is made up of four crosses pattee alternating with four fleurs-de-lis. While the Sovereign's crowns have four half arches, the coronet only includes two half arches. The arches are surmounted by a ball, on top of which is a cross. Within the frame, which is made of gold, is a velvet cap lined with ermine fur. The present crown was made for the investiture of Charles in 1969. Previous crowns are also retained in the collection.
The remaining regalia date from the investiture of Edward, later Edward VIII and then Duke of Windsor, in 1911, when most of the elements of the Honours were redesigned.