circlet

plural circlets

1. A small circle.
2. 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.

   1913 January–May, Edgar Rice Burroughs, “The Gods of Mars”, in The All-Story, New York, N.Y.: Frank A. Munsey Co., →OCLC; republished as “Thuvia”, in The Gods of Mars, Chicago, Ill.: A[lexander] C[aldwell] McClurg & Co., September 1918, →OCLC, page 69

3. A crown without arches or a covering.

   Her faire lockes in rich circlet be enrold.

   1590, Edmund Spenser, “Book III, Canto V”, in The Faerie Queene. […], London: […] [John Wolfe] for William Ponsonbie, →OCLC, stanza 5

4. A round body; an orb.

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

   1667, John Milton, “Book V”, in Paradise Lost. […], London: […] [Samuel Simmons], and are to be sold by Peter Parker […]; [a]nd by Robert Boulter […]; [a]nd Matthias Walker, […], →OCLC; republished as Paradise Lost in Ten Books: […], London: Basil Montagu Pickering […], 1873, →OCLC