Circlet
Circlet , noun
1.
A little circle; esp., an ornament for the person, having the form of a circle; that which encircles, as a ring, a bracelet, or a headband.
Her fair locks in circlet be enrolled.
2.
A round body; an orb. — Pope
Fairest of stars... that crown'st the smiling morn
With thy bright circlet.
3.
A circular piece of wood put under a dish at table. [Provincial English] — Halliwell