“魏氏以夜严为怪石,宋客以燕砾为宝珠。”刘勰在《文心雕龙》中说过这几句话后接着便感叹“文情难鉴,谁曰易分？”把夜光珠当作怪石,出卖的价格就便宜,甚至不值钱,但并不代表夜光珠就没有价值。《伊文子·大道》记“魏之田父得玉径尺,不知其玉也,以告邻人。邻人给之曰:‘怪石 “Weisi in the night for the rock, Song guest to rubble for the Pearl.” Liu Xuan in “Wen Xin Diao Long” said these words and then lamented “literary difficult to learn, who said easy points?” The luminous beads as a rock, betrayed the price cheaper, or even worthless, but does not mean there is no value luminous beads. “Yi Wenzi Avenue” in mind "Wei Zhi Tian father Yu diameter feet, I do not know their jade also, to the neighbors, neighbors to say: ’rock