Accessory worn on "Downton Abbey" (5)

I believe the answer is:

tiara

(Other definitions for tiara that I've seen before include "Ornamental headpiece" , "It bejewels" , "Jewelled head ornament" , "Woman's head ornament" , "Crescent-shaped headdrsss or Pope's diadem" .)

I've seen this clue in The Washington Post.

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