Yajin, also referred to as shijian er, is a type of traditional Chinese accessory typically worn on the lapels of Chinese clothing. These ornaments are generally positioned hanging down on the right side of the chest area, where they serve to press against the fabric.
The yajin first appeared during the Tang dynasty and gained significant popularity throughout the Ming and Qing dynasties. Various styles exist, including a dangling pendant-style and a bracelet-style known as shibazi. Additionally, yajin can be used as accessories on the cheongsam, where they are tied onto the pankou knots.