Simple past tense and past participle of diadem.(verb)
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Use "diademed" in a sentence
"In this program Pavlova was robed in shimmering white and silver, with diademed head and ankles tied with rosy ribbons … The fairy scene vanishes and a radiant figure — (Pavlova) — [re -] enters the stage walking with the delicate precision and grace of some wild bird."
"An armored knight kneeling before a robed and diademed woman."
"Arriving in the sultanate of Yogyakarta we caught a glimpse of the cloud-diademed peak of Merapi, just 25 kilometers away."