《南齐书·志·卷十七》
过去相沿三公以下戴的礼帽有七旒，用青玉珠串，卿大夫以下戴的礼帽有五旒，用黑玉珠串。
旧相承三公以下冕七旒，青玉珠，卿大夫以下五旒，黑玉珠。
In the past, the seven-pole hats worn by the three princes and below were made of blue jade beads, while the five-pole hats worn by the noble officials and below were made of black jade beads.