Bi disc "Huan", late Neolithic, Bronze Age, c. 2000-500 BCE, diameter 10.5"; beautiful waves and clouds pattern, fine quality
Different kinds of jade discs with varying widths and ratios between the width of the diameter of the central opening and width of the jade band have been classified in the ancient
Chinese etymological disctionary Er Ya, an 11th century BCE text. According to this ancient reference, a disc with a central opening measuring in width half of the jade
band is called a bi. A disc with the a central opening measuring twice the jade band is a yuan and finally a disc with central opening and jade band of equal width
was deemed a Huan. Presented is this example of a Huan.
