gem:
(plural: ‘gems‘; pronunciation: the letter ‘g’ in this word rhymes with the letter ‘j’ in the word “judge”)
a person (or a thing) that is more valuable or better than others of the same type,

(My little gal is a gem!)
Tom is a gem in my class.
According to Urban Dictionary, gem is also used to refer to someone or something in a sarcastic way, as in “Peter our friend is a real gem; he never lifts a finger to help any one of us when in need!
When I was in Addis Abeba, Ethiopia, working as a teacher, I had several friends from the locals and some of them were gems because of whom I have never had any qualms about my working in a foreign land among totally strange people.
We often come across gems in every field: there are gems in educational institutions, business, sports, politics and entertainment that show us how a person can reach his goals and ambitions, never leaving the ethics and morals!

(some gems)
