A circlet of flowers worn in a woman's hair is called a
garland.
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a circlet is a small chic crown that you put around your bun for
a party or other event
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There is a ring shapes ornament called a circlet, usually worn
on the head
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A circlet is a piece of jewelry which is a simple circle. It is
also an open crown. So you could use it in a sentence as follows:
During the coronation a circlet of gold was placed on her head.