The so-called emerald is the feather of kingfisher. Before the invention of dye technology, kingfisher feathers were natural and rare decorative materials, which were often used by jewelers to inlay pearls, precious stones and gold wires. Jade feather decoration has a long history, which can be traced back to the Warring States Period. The story of "returning pearls with gifts" was told in "Tales of Han Feizi, Top Left", in which the box of "Jade Collection" mentioned should be decorated with kingfisher feathers.
All opera actors need a "head". The so-called "head" refers to the whole hair styling and accessories, which are divided into "soft head" and "hard head". For example, the shape of twelve women in A Dream of Red Mansions borrowed from the sticker in the soft head, which looks like a small CD. "Hard head" is all kinds of blingbling ornaments inserted on the actor's head. Diancui is one of them, and the other two are rhinestones and silver ingots.