This idiom means making a poor judgment by valuing appearance over substance.
Chǔguó yǒu gè shāngrén dào Zhèngguó qù mài zhēnzhū
楚国Chǔguó🔊有个yǒu gè🔊商人shāngrén🔊到dào🔊郑国Zhèngguó🔊去qù🔊卖mài🔊珍珠zhēnzhū🔊。
Tā bǎ zhēnzhū zhuāng zài yí gè fēicháng piàoliang de hézi lǐ
他tā🔊把bǎ🔊珍珠zhēnzhū🔊装在zhuāng zài🔊一个yí gè🔊非常fēicháng🔊漂亮的piàoliang de🔊盒子里hézi lǐ🔊。
Zhèngguó rén kàndào hézi fēicháng jīngměi jiù mǎi xià le
郑国人Zhèngguó rén🔊看到kàndào🔊盒子hézi🔊非常fēicháng🔊精美jīngměi🔊，就jiù🔊买下了mǎi xià le🔊。
Kěshì tā bǎ zhēnzhū huán gěi le shāngrén zhǐ liú xià le hézi
可是Kěshì🔊他tā🔊把bǎ🔊珍珠zhēnzhū🔊还给了huán gěi le🔊商人shāngrén🔊，只zhǐ🔊留下了liú xià le🔊盒子hézi🔊。
English Translation:
A merchant from Chu went to Zheng to sell a pearl. He put the pearl in a very beautiful box. The person from Zheng saw the exquisite box and bought it. But he returned the pearl to the merchant and only kept the box.