"The Engishiki" (an ancient book for codes and procedures on national rites and prayers), showing the manners and customs of the Bureau of Skilled Artisans, describes in detail the materials and other aspects of the agate belts worn by the Emperor.
なお、『延喜式』内匠寮式には天皇の瑪瑙帯の材料等が詳しくのせられている。