《旧唐书·本纪·卷七》
他们的腰带一品至五品都用金；六品七品官员都用银，八品九品官员都用钅俞石。
其腰带一品至五品并用金，六品七品并用银，八品九品并用鍮石。
Their belts from the first to fifth rank were all made of gold; both sixth and seventh rank officials wore silver belts and both eighth and ninth rank officials wore belts of mica stone.