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'Perfect' Archduke Joseph diamond sells for 13 million pounds

The 76-carat Archduke Joseph diamond recently sold by the Christie's auction house in Geneva to an anonymous bidder.

But a diamond is simply an allotrope of the element Carbon, the same element makes up a different structural form, Graphite, which doesn't cost as much and has very different physical properties.  Find out about allotropes of carbon by visting THIS PAGE and watching the You Tube video below:


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