Diadem

diadem \DY-uh-dem\, noun:
1. A crown.
2. An ornamental headband worn (as by Eastern monarchs) as a badge of royalty.
3. Regal power; sovereignty; empire; -- considered as symbolized by the crown.

transitive verb:
To adorn with a diadem; to crown.

A picture of a diadem.

"The highlight of the contest was seeing the winner being crowned with a sparkling diadem."

Diadem is the second brightest star in the constellation Coma Berenices. Coma Berenices is Latin for "Berenice's Hair".

"The diadem sparkled brilliantly in Berenice's hair."

It is also a garden spider!

"There was a diadem spinning its deadly web between the garden shed and the wall."

A diadem is a girl's best friend