the jewel in the crown 王冠宝石，精华

英文释义

(IDIOM) The finest or most valuable item among a group of similar items.

例句

While the huge hospitality company owns fine hotels in several cities, its managers feel their splendid old hotel in the capital is the jewel in the crown, and speak about it proudly.

尽管这家大型酒店管理集团在好几座城市拥有出色的酒店，但经理们认为，位于首都的那座华丽老酒店才是王冠宝石，在说起它时感到骄傲。