diadem

An ornamental headband worn as a badge of royalty.

The Apollon wing of the Louvre has a set of historic crowns, diadems and sovereign jewellery.

A crown.

And vvhen the princely Perſean Diadem, / Shall ouervveigh his vvearie vvitleſſe head, / And fall like mellovved fruit, vvith ſhakes of death, / In faire Perſea noble Tamburlain / Shall be my Regent, and remaine as King:

I am his firſt borne ſonne, that vvas the laſt / That vvare the Imperiall Diademe of Rome, […]

Regal power; sovereignty; empire—considered as symbolized by the crown.

An arch rising from the rim of a crown (rarely also of a coronet), and uniting with others over its centre.

To adorn with a diadem; to crown.

The star of her destiny is the morning star of the new-born century. O’er the Golden Gate it glitters, diademming this youthful Queen of the Pacific in her robes of freedom gorgeously inlaid with gold.

Paul cites as an example the Macedonian churches and mentions specifically several things about their liberality which adorn their grace and crown it with beauty as the lily work diademmed the pillars of the Temple.