'Diadem' in the Bible

At that time, the LORD of the Heavenly Armies will become a glorious crown, a beautiful diadem for the remnant of his people,

You will be a crown of splendor in the LORD's hand, and a royal diadem in the hand of your God.

Then I said, "Let them place a pure diadem on his head." So they placed the pure diadem on his head and clothed him with fine garments while the angel of the LORD was standing beside them.