The decoration of the arches may take many forms, sometimes consisting of large pearls, as in the usual way, sometimes of architectural crockets as in much of the carved decoration, or as jewelled running ornament composed of national Badges, or of oak-leaves and acorns as in that which is known as the Imperial State Crown. A fine example of the Tudor crown occurs in the stained glass roundel of the Arms of Queen Jane Seymour, in which the arches are crocketted, and the crosses have the cusped character that was prevalent at this period, Fig. 168. In the jewels on the rim, no attempt is usually made to copy those of the actual crown and great variety of jewelled decoration is therefore possible. The gems are most often represented of antique form, that is to say, cut _en cabuchon_, instead of in facets, thus presenting a decorative simplicity that is very suitable to ornamental effect. [Illustration: FIG. 168.--Arms of Queen Jane Seymour, Stained Glass Roundel. Sixteenth Century.] With regard to the cross on the orb the former remarks concerning crosses pattée are especially applicable, and in addition it should be observed how much more satisfactory it is for the lines of the lower limb of the cross to be produced from the circumference of the orb than for the corners to be projected beyond it. In the latter case the cross has the unfortunate effect of being balanced on the orb instead of rising from and being part of it. The essential form of the crown, then, is a circlet heightened with crosses and fleurs-de-lis alternately, from which rise two arches that spring from behind the crosses pattée and uphold the orb, which is itself surmounted by a cross. Care is necessary in order that the curves of the arches may be kept sufficiently flat, for otherwise too much tendency to a half-circle may result. The crosses and fleurs-de-lis offer remarkable opportunities for strong, graceful, and varied treatment, and if they are kept fairly high, and well defined, the dignity of the design is much enhanced. The cap which is enclosed in the actual crown is of purple velvet, but is represented heraldically as of crimson, and is lined with ermine, which being turned up at the edge, appears round the lower rim. The Coronets of the sons and daughters of the Sovereign have similar circlets to that of the crown, but are not enarched, except in the case of the Prince of Wales, who has one arch supporting an orb. The latter coronet is usually drawn from a point of view from which the complete arch is seen spreading from side to side. Fig. 169.