What is it that makes a diamond so attractive, and probably more sought after than any other gem?  It is very hard and durable; yes, being 10 on the Mohs scale.  It facets beautifully, and has industrial uses as well simply featuring in the jewellery trade.  Diamonds can also be found in a variety of colours, including black, brown, yellow, with pale blue, and then red, green, and even pure orange and violet, which are the most rare.  Formed up to 150 km under the ground, millions of diamonds...
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