A diadem is a crown worn by a king or royalty. It can also signify holiness.
Diadem only occurs a couple of times in the Bible, all in the Old Testament. Usually it’s in reference to the first priest, Aaron, on whose head it was place by Moses. Interestingly, the diadem was attached to his turban. In this instance, it is called a sacred diadem.
Isaiah refers to a royal diadem or crown of splendor as a visual image of how much God values his people.
Key verse about Diadem: You will be a crown of splendor in the Lord’s hand, a royal diadem in the hand of your God (Isaiah 62:3, NIV)
A lifelong student of the Bible, Peter DeHaan, PhD, wrote the 1,000-page website ABibleADay.com to encourage people to explore the Bible. His main blog and many books urge Christians to push past the status quo and reconsider how they practice their faith in every area of their lives.