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Diamonds are formed of carbon atoms. 12.01 grams pure carbon powder is known as one mole. The number of atoms in this one mole is 6.02x1023. This number is known as Avogadro’s number.

The diamond with 12 milligrams (or 0.06 carat), has

$\dfrac {6.02\times 10^{23}\times 0.12} {12.01}$

$= 6.02\times10^{21}$

That means 0.12 grams or 12 milligrams Diamond contains $= 6.02\times10^{21}$ molecules.

In case of Diamond,
Number of Atoms = Number of molecules $= 6.02\times10^{21}$

Which means, it's a 6 with 21 zeroes or 6 sextillions or 6 thousand billion-billion atoms in 12 milligrams of the diamond.

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