買櫝還珠（買櫝還珠）　

◎ 買櫝還珠 mǎidú-huánzhū

[show lack of judgement as one who buys the glittering casket and return the pearls to the seller] 買珠只取包裝的盒子而退還珠子。比喻沒有眼光,取舍失當(dāng)