Hidden gems means something which is extremely outstanding and not many people may know about. In the present context (Late Answers Review Queue), where people come out of blue and provide an exemplary answer.

Examples of exemplary answers: http://askubuntu.com/badges/25/great-answer

Hidden gems means something which is extremely outstanding and not many people may know about. In the present context (Late Answers Review Queue), where people come out of blue and provide an exemplary answer.

Examples of exemplary answers: https://askubuntu.com/badges/25/great-answer