circlet

A small circle.

A ring (typically of gold or silver) worn as an ornament on the head.

He wore in addition to his leathern trappings and jewelled ornaments a great circlet of gold about his brow in the exact centre of which was set an immense stone, the exact counterpart of that which I had seen upon the breast of the little old man at the atmosphere plant nearly twenty years before.

A crown without arches or a covering.

Her faire lockes in rich circlet be enrold.

A round body; an orb.

Fairest of stars […] that crown'st the smiling morn / With thy bright circlet.