"The mounts on St Edward's Crown, together with the enamelwork on the Sovereign's Sceptre and Orb constitute the most important surviving corpus of English enamelling of the Restoration. The genesis of their style and technique is more easily traced than their authorship, which can only be guessed at. The openwork construction of the Crown mounts, comprising buds and foliage, recalls the layered plates of major jewels dating to the 1620s and 1630s in which diamonds in gold collets on the upper layer are set off by enalled buds, pellets and foliated forms on the lower. A portrait in the Alte Pinakothek, Munich by Peter Paul Rubens of his second wife, Hélène Fourment, whom he married in 1630, shows her wearing a bodice ornament of this type."
"The settings on St Edward's Crown are unusual in having red detailing; the other enamelled Restoration pieces in the Regalia are however decorated with a similar repertory of calligraphic scrolls, leafage, buds, dashes and dots executed in black with touches of pink and blue."