Bug in Prince Caspian (narnia) Jar game

I collected all the colored stones in the Peter's game....red, yellow, blue, green, white, purple, orange. But there is no event in the game till the end where one of the side character must help in arranging the stones into a collectible/artefact called Lion Shaped Gem. Can somebody fix the bug ? Please !!!!

I played this game 10 times but could not find a way to get the artefacts arranged from the collected stones. I am sure there must be a bug.