Which Is The Hardest Mineral?

You would have never thought that those pretty looking Diamonds are the hardest mineral on earth. It is four times harder than corundum as well as included in the family of ruby and sapphires. However being the hardest thing on Earth Diamonds are still very delicate and easily shaped, cracked and broke. This aspect makes it the most favorable rock as far as the jewelry designers are concerned. An unpolished diamond is considered as the hardest mineral, in fact it is used to drill and cut and smooth other metal surfaces. Hardness of any mineral is determined by the resistance it shows from outer powerful elements. Generally diamonds are pale, blue or transparent.