Diamonds are considered one of the toughest natural minerals and among the rarest substances on earth. They are pure crystals made of a single carbon element and are formed under extreme conditions of high pressure and high temperature within the earth's depths, ranging from 120 to 200 km beneath the surface. Each natural diamond is unique and has gone through a remarkable journey. The word "diamond" is derived from the Greek word "Adamas", which means "unconquerable" and "immortal".