《幼学琼林·卷三·珍宝》
拿小的价值较差的东西，引来较大较好的东西，这种方式称为抛砖引玉。只看外观不知实际的价值，这钟贪贱失贵的行为叫做买椟还珠。
以小致大，谓之抛砖引玉；不知所贵，谓之买椟还珠。
Use something small and of lesser value to attract something bigger and better, this method is called "throwing a brick to attract jade". Only looking at the appearance and not knowing the real value, this kind of greedy and ignorant behavior is called "buying the box and returning the pearl".