The Tunisian Diamond is a cloudy blue diamond worth 12 million US dollars. Its size seems to be the biggest factor in its price. It is also obviously hard and heavy. That is evident from the basket fail, when Henry tries to put the diamond in his scooter basket, but its weight flips the scooter and launches Henry flying into air.
Henry can take the diamond in 3 different ways.
Henry attaches the diamond with his scooter via a tow cable and rides away. This induces a hot police pursuit, as Henry rides the diamond on the road. When he reaches the dead end (broken bridge) and has gets ambushed by police, the diamond saves him, as he pushes it with his leg, and falls down the bridge, and wins because he gets the diamond and survives the ambush by police, who think he died after the fall.
Henry sneaks his way to the diamond, and eats a Super Mushroom, which turns him into a giant. A massive chaos occurs, and he easily smashes the protection glass and takes the diamond with his bare fingers, which is tiny from his perspective (it appears as an average sapphire). The Center for Chaos Containment sends a giant robot to the museum, which destroys the museum. Henry, now small again, runs away successfully, and the diamond somehow gets launched from the museum and lands right next to him.
He sneaks his way to into the museum by going silently from above. He uses a wire to carefully brings himself down to the exhibit, where he breaks the protection glass silently, with a hammer. He takes the diamond, escapes through a back door and kills a guard standing in his way by dropping the diamond on him and brutally squashing him. This is another proof of the diamond's massive weight. Later, during the credits, it shows some things he bought using the diamond.
- A real life clear diamond its size, on the contrary, is easily 30 million dollars. So, it's easily worth a good 50 million US dollars.