紅山文化
"Gogok" is also sometimes romanized as "kog-ok" and "kokk-ok" or "kok-ok." It is the equivalent of the Chinese pig dragon or "zhūlóng" from the Hongshan culture of neolithic China. They are also found in Japan (Magatama) and especially in Northern Kyushu from Jōmon period populations. Although usually made from jadeite mined in Japan, they have been discovered made from many different materials such as nephrite, stone, clay, bone and glass. They range in size range from , and have a small hole in the middle of the round part for threading. They were used as earrings and necklaces, and as decoration on crowns, belts, and bracelets. Some are further decorated with gold or silver attachments.