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A diamond is by far the hardest material on earth.

On the Mohs scale of hardness -- ranked 1 to 10 -- diamonds are 10, which is more than 10 times harder than the closest at 9, a ruby - corundum (aluminium oxide).

The stone, marble, is usually in the 6-7 range. A toy marble can be made from glass, clay, steel, or agate, none of which is as hard as a diamond.

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