All you need to do in the Diamond Mine cart is to duck down into the cart when the ceiling gets close, then jump over the wooden barriers (it says "Jump" a little late).
The mine cart ride is the final challenge at the Diamond Mine on Nabooti Island. The only thing you need to do is duck down when you are close to the ceiling, and jump up to avoid the boards immediately after that (repeats three times). (see related question)
On the mine carts you duck jump duck jump duck jump then stay
Dodge the mine carts, go down the elevator, blast the rock and the wall, ride the mine cart, and get the White Jewel from the diamond pile. (see related question)
In the final area of the Diamond Mine, DUCK DOWN when the mine cart gets close to the ceiling, and JUMP when there is a rock in your way (there are three of each). You should jump *before* you reach the sign that says Jump.
On the mine car rolling through the Diamond Mines, duck down when you get close to the roof, and jump over any rock that sticks up (there's a warning sign).
Go to youtube.com and search for it and they will show you a video! how easy.
you must finish the cart ride or go backwards to the end of the cave and press the green button
You can always backtrack out of the diamond mine. When you reach the end of the cart ride, use the magnifier to choose the correct white jewel from the bunch of diamonds. (It has a triangular mark on it.) Click on the hole in the roof to leave.
Ride the mine cart to the end. When it gets close to the ceiling, duck down. When it gets to each barricade, jump over. (You will do this three times and you can try as many times as needed.)
In the Diamond Mine, the final stage is a cart ride through the mine. When the track gets close to the ceiling, duck down into the cart. When you come to a board sticking out over the tracks, jump it. (You may have to jump before you see the sign that says "jump".) After three sets of ducking and jumping, you reach the end of the cart track. Use the magnifier at the bottom right of the screen to examine the diamonds, and find the one that has the triangular mark identifying the White Jewel of the Nabooti. (see related question)
The diamond mine contains the white jewel.Before going to the Mines, you will need to complete the Safari, where you will get a hardhat. You will enter through the electric fence, dodge the mine carts, blast the mine wall with explosives, and ride the cart to the end of the mine. There, you will find the jewel hidden in a pile of diamonds.(Full solution : see the related question)
In the Diamond Mine, the final stage is a cart ride through the mine. When the track gets close to the ceiling, duck down into the cart. When you come to a board sticking out over the tracks, jump it. (You may have to jump before you see the sign that says "jump".) After three sets of ducking and jumping, you reach the end of the cart track. Use the magnifier at the bottom right of the screen to examine the diamonds, and find the one that has the triangular mark identifying the White Jewel of the Nabooti. (see related question)