Thanks, it sorted all out on its own, the monster was actually moving around the map on its own, attacking other monsters. The sapphire eventually appeared too :)
Another question, is there any way to increase backpack size?
Also, after clicking on premium button, there's a note saying something about a complete walk through, where can one find it? Oh, and I would've pay for the premium anyway, the game is fun to play, but was curious about that walkthrough