《晋书·志·第十五章》
皇太子用的金玺有龟形钮，朱黄绶带，四种彩色：赤、黄、缥、绀。
皇太子金玺龟钮，硃黄绶，四采：赤、黄、缥、绀。
The golden seal used by the crown prince had a turtle-shaped knob, a vermilion and yellow ribbon, and four colors: red, yellow, light green, and dark blue.