# Dropping the Physics, Both diamonds and pencil lead (or more accurately,...
Dropping the Physics

Both diamonds and pencil lead (or more accurately, pencil graphite) are composed entirely of carbon. They are chemically identical! The differences are in their physical structures. Carbon atoms in diamonds have strong bonds with each other, whereas carbon atoms in pencil graphite form weakly bonded layers which makes graphite brittle.

Although diamonds are the hardest natural material, they are thermodynamically unstable and will, over a very long duration, decay into pencil graphite. Diamonds are not forever!

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    So not only did your pencil graphite have a chance of being turned into diamonds, but your diamonds will be able to be...
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    Another reason to be unimpressed with diamonds.