The origin of gogok is contested by archaeologists because these jewels are common in Kofun period tombs of Japan, where they are known as magatama. One archaeologist, James Keally, who believes gogok originated in Japan, cites the fact that gogok have been reported in Jōmon sites in Tohoku as early as about 1000 BCE.[7][8]
https://en.m.wikipedia.org/wiki/Gogok
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