Coronet
While non-royal dukes are entitled to a coronet of eight strawberry leaves, to bear at a coronation and on his coat of arms, royal dukes are entitled to princely coronets (four crosses patée alternating with four strawberry leaves). The coronets of the royal family are dictated by letters patent. The Duke of York bears by letters patent, and the Duke of Edinburgh was granted in 1947 use of, the coronet of a child of the Sovereign (four crosses patée alternating with four fleurs-de-lis), while the Duke of Cornwall and Rothesay has use of the Prince of Wales Coronet, the Duke of Cambridge the coronet of a child of the heir-apparent and the current Dukes of Gloucester and of Kent, as grandsons of a Sovereign bear the corresponding coronet.
At coronations, apart from the differentiation in Princely coronets to ducal coronets, a Royal Duke also bears six rows of black dots in the ermine, as opposed to four rows of dots for a duke.
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Coronet of the Duke of Cornwall and Rothesay
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Coronet of the Duke of Cambridge
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Coronet of the Dukes of Edinburgh and of York
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Coronet of the Dukes of Gloucester and of Kent
Read more about this topic: Royal Dukedoms In The United Kingdom