《太平广记·卷二百二十九·器玩一》
所谓浮金，是说它能自浮水上；所谓轻玉，是说它的质的透明而又比一般的玉石轻。
浮金者，自浮水上。轻玉者，其质贞明而轻也。
Floating gold means it can float on the water. Light jade means its substance is transparent and it is lighter than other jades.