Deduce the disposition of the diamonds in this mind-bending dueling game!

In Orapa Mine, you are diamond hunters racing to determine the positions of 5-7 colored gems on their opponent's mine grid. Take turns firing a wave (line) from an edge of the grid; the exit point and the color of the wave informs you of the angles and colors of gems the wave touched before leaving the grid. Though clever guessing and triangulation, be the first to guess the exact disposition of the gems in their opponent's mine and win!