'Diadems' in the Bible

And there was seen another sign in the heaven, and, lo, a great red dragon, having seven heads and ten horns, and upon his head seven diadems,

And I stood upon the sand of the sea, and I saw out of the sea a beast coming up, having seven heads and ten horns, and upon its horns ten diadems, and upon its heads a name of evil speaking,

and his eyes are as a flame of fire, and upon his head are many diadems -- having a name written that no one hath known, except himself,