gem
/dʒem; dʒɛm/ n
1 precious stone or jewel, esp when cut and polished 宝石（尤指经切割打磨的）
a crown studded with gems 镶宝石的皇冠.
2 (fig 比喻) thing highly valued for beauty or some other special quality 宝物; 精华; 珍品; 美丽绝伦的事物
This picture is the gem (ie the best) of the collection. 这幅画是收藏的珍品.
a gem of a place, ie an excellent place 胜地
That restaurant is a little gem. 那餐厅是个小乐园.
She's a real gem! 她美如仙子!