Classic PC game - does anyone remember that old game where you collected shapes with a digger or truck

If the shapes are diamond looking, then the game is called Digger. You are the digger and you try to collect the diamonds before the bad guys, called Nobbins and Hobbins, get you. No, sorry, there were no enemies, and multiple shapes + colours. Just had a black background. However all that is as far as i can remember! If u had a link to a screen shot..