Gǔdài yùpèi zuì shàngmiàn de héngyù héng zài xiōngqián.
The top jade of an ancient pendant set hung horizontally across the chest.
Tips
history
珩 names the horizontal top jade of an ancient ceremonial pendant set and is not used as a free word in modern Chinese. Its one living use is the technical term 珩磨 (to hone a precision bore). It is built on the jade radical 王.
register
Classical and technical only. Outside 珩磨 you meet 珩 mostly in writings on ancient jade.