'Diadem' in the Bible

He also put the turban on Aaron’s head, and on it, in the front, Moses placed the golden plate, the holy crown, just as the Lord had commanded him.

“I put on righteousness, and it clothed me;My justice was like a robe and a turban!

“Surely I would [proudly] bear it on my shoulder,And bind the scroll around my head like a crown.

In that day the Lord of hosts will become a magnificent crownAnd a glorious diadem to the [converted] remnant of His people,

To grant to those who mourn in Zion the following:To give them a turban instead of dust [on their heads, a sign of mourning],The oil of joy instead of mourning,The garment [expressive] of praise instead of a disheartened spirit.So they will be called the trees of righteousness [strong and magnificent, distinguished for integrity, justice, and right standing with God],The planting of the Lord, that He may be glorified.

You will also be [considered] a crown of glory and splendor in the hand of the Lord,And a royal diadem [exceedingly beautiful] in the hand of your God.