Troika

"In the not too distant future, a group of scientists discover some very special stones on another planet. If you get three of the same stones, you can turn them into a valuable jewel or fuel. After hearing the news about these stones, you have decided to travel to the planet where they are to make you rich. You reach the planet safe and sound, but your spaceship has had technical problems during the trip and you have run out of fuel. What a dilemma! You want to turn stones into jewels but at the same time you need the fuel to be able to return to Earth. However, you're not the only person with that idea. Will you be able to get more jewels than the others and still leave the planet?"