gem 
/ˈʤɛm/ noun
plural gems /ˈʤɛm/ noun [count] 1 : a valuable stone that has been cut and polished for use in jewelry — see color picture 2 : something that is admired for its beauty or excellence
▪ The house is a gem of colonial architecture. ▪ He pitched a gem of a game. ▪ Her most recent novel is a real gem.
▪ The house is a gem of colonial architecture. ▪ He pitched a gem of a game. ▪ Her most recent novel is a real gem.
