Bring forth the roy-al di-a-dem, And crown Him Lord of all” Do you remember singing that line before? It is from All Hail the Power of Jesus Name. Have you ever asked what a Diadem was? I have been asked that question several times, so I think I will answer that question in my blog. Diadem, in the Biblical setting, would have referred to the knot or brooch that would have been attached to the turban of a king or ruler to show his status. See the picture of a statue of a Persian King.
In the bible, Aaron and all the high priests after him would have worn one; this is seen in Exodus 28:36-38.
36 "You shall make a plate of pure gold and engrave on it, like the engraving of a signet, 'Holy to the LORD.' 37 And you shall fasten it on the turban by a cord of blue. It shall be on the front of the turban. 38 It shall be on Aaron’s forehead, and Aaron shall bear any guilt from the holy things that the people of Israel consecrate as their holy gifts. It shall regularly be on his forehead, that they may be accepted before the LORD.
Turbans were quite common in the Holy Land area in Bible times as they still are today. So the diadem was a show of status. Later in history, they took the idea of a diadem and turned it into a crown that we think of now. So if you hear someone say that a diadem is a crown they are kind of right.