It is same that the form of Yu Bi and jade annulus is made, it is medium only the measurement of aperture is different just.
Chinese jade culture is the mainest component of Chinese culture, an ancient name for China 5000 never discontinuous over- , the earliest but restrospect to 7, the red hill culture before 8000, the primitive form of dragon appears in red hill culture. 
Yu Bi is compressed circle implement, there is round opening among, general thinner. Be in early 4500-5300 year the fine between smalls piece of land surrounded by water culture appeared many Yu Bi, of glazed body, have those who have grain act the role ofing. 
Divine jade times thinks jade is a quick look implement, yu Bi is exceeding lofty or great () of Cang Bili day, this one period lasts to Xia Chao all the time from red hill culture, basically accuse jade article by koradji palm, use at communicating ghosts and gods of heaven and earth. Arrive all the time from Xia Shangzhou Tang Chao is king jade times, jade article is the delegate of crown, if be mixed famously family name a round flat piece of jade with a hole in its center. At this moment jade article has royal ability to use jade article only, build of inchoate jade a round flat piece of jade with a hole in its center is not big, general diameter does not exceed 25 centimeters, arrived Han Daiyu a round flat piece of jade with a hole in its center begins to greaten some, grain act the role ofing also has change. 
Tang Mo began to enter civilian jade phase to Song Chao, be jade article can enter common people home! 
Yu Bi's utility
The utility of different times jade a round flat piece of jade with a hole in its center is different, a round flat piece of jade with a hole in its center of jade of divine jade times basically uses Yu Tongling, it is deities of ground of exceeding lofty or great of channel of koradji use jade article. Yu Bi is used at communicating a day! A round flat piece of jade with a hole in its center of jade of king jade times represents crown, also can use at mortuary, usable also Yu Jibi. Civilian jade times, yu Bi can serve as gift to give, in order to show friendliness, also can make department wall. Department wall hangs those who go up in lumbar occasional neck to act the role of namely article. Yu Bi develops today have been to blot out the sky and cover up the earth! It is us present buckle in safety. 
Contemporary of exorcise evil spirits of Bi Zhenzhai of useful also jade. 
What see Yu Bi from above picture is medium Kong Dou is not big, yes, the distinction of Yu Bi and jade annulus depends on this, it is with Yu Bi's diameter accurate, the half that bore diameter is less than diameter of jade a round flat piece of jade with a hole in its center is Yu Bi, the half that contrary aperture is more than a diameter is jade annulus. Pursue as follows
