But as times went by, the weight of ryo became far apart from the value of ryo; in Kamakura period 1 ryo of gold was equivalent to 5 monme and that of silver 4.3, then in the late Kamakura period, 1 ryo of gold turned to be 4.8 monme from 4.5.
だが次第に質量と額面が乖離するようになり鎌倉時代には金一両は5匁、銀は4.3匁となり、鎌倉後期には金一両が4.5から4.8匁へと変化している。