What

Riddle: What's more precious than rubys, more lasting than gold, what can never be traded stolen or sold, what comes with great effort, takes time but then once yours will serve you again and again?

Answer: Knowledge.

Source: https://www.riddles.com/7954

Riddle: What's more precious than rubys, more lasting than gold, what can never be traded stolen or sold, what comes with great effort, takes time but then once yours will serve you again and again? Answer: Knowledge. — by LilyABC v1.

Riddle: What's more precious than rubys, more lasting than gold, what can never be traded stolen or sold, what comes with great effort, takes time but then once yours will serve you again and again? Answer: Knowledge. — by LilyABC v2.