It is worn over the shield by way of crest, as mitres and coronets are. Coronets for viscounts have 16 silver balls, of which seven are displayed. Crowns and coronets of various kinds are constantly seen. After 1661, however, viscomital coronets became engraved, while baronial coronets were plain. The loyalist coronets are used only in heraldry, never worn. Finally, baronial coronets have six silver balls, of which four are displayed. French heraldry has a set system of crown and coronets. Another notable difference from traditional heraldry was the toques, which replaced coronets. Dukes were the first individuals authorised to wear coronets. Coronets of Princes of Wales have been rarely used. There were specific coronets for counts, barons, and nobility. The shield was retained, but ecclesiastical hats often replaced helmets and coronets. Queen Mary suggested the coronets be silver-gilt in a medieval style with no decorations. George VI agreed, and the coronets were designed with Maltese crosses and fleurs-de-lis. During the Coronation, peers and peeresses put on coronets.