Diamond is one of the many allotropic forms that can contain carbon, the diamond, in fact, is made from a crystal lattice of carbon atoms arranged in a tetrahedral structure and it is the hardest natural mineral source that is known; its hardness on the Mohs scale (empirical criterion for the evaluation of the hardness of the material) is 10. Due to its hardness, a diamond can only be scratched by other diamonds and is able to keep the polishing for long periods of time. The word diamond comes from the greek "adamas - invincible" a term that had its root in the use of steel, iron and it was only later that Aristotele used it to delineate the precious mineral. The first diamonds were mined more than 2800 years ago in India, but the modern mining industry was born thanks to the discovery of the South African mines in the nineteenth century.
To recognize a real diamond from a fake you can do "home-made" test; here are some tests that can be conducted at home without the aid of expensive equipment and without being an expert gemologists and that can be performed when the Brilliant is not embedded in any valuable object.