What is a diamond?
A diamond is a crystal made up entirely of carbon atoms. When the crystal forms without any interference it becomes a pure and perfect octahedral shape, however, during their growth most diamond crystals encounter varying heat or pressure, or even other diamond crystals, and this can alter their form and characteristics. These alterations help determine the shape, color and clarity the polished gem has once it emerges from the earth.
In addition to their superior brilliance, luster, fire and dispersion, diamonds are also the hardest natural substance on earth. Diamonds rate a 10 on the Mohs scale of hardness, which means they are resistant to scratches and do not easily break, chip or crack; diamonds are several times harder than the next-hardest substance, corundum, which is more commonly known as ruby and sapphire.