dianzi
Traditional Chinese hair accessory of the Manchurian people.
It's semicircular in shape, reminiscent of a tiara, and its literal translation is hat ring.
It's often a made up of a metal frame, adorned with materials like silk or rattan. Common patterns on the dianzi includes dragons, phoenixes, butterflies, bats, flowers and clouds. Not to be confused with the Zhuang hat.