Since the circlets of these two crowns were worn at coronations and openings of parliament without the arches, and since the QEQM crown contains diamonds from the Victoria circlet, I do think there should be an accurate description of these two circlets. Boffer's edited version is much better. The complete crowns, with arches, are of course displayed with the crown jewels at the Tower.
It might be worth noting that the alternate elements from Queen Victoria's circlet are now mounted on the Countess of Wessex wedding tiara. The Queen Maud circlet also survives, though worn without the fleur de lys motifs.
Edit: Boffer, is there any indication whether the Queen Adelaide circlet survives, even as an empty frame?