Diamond is the one gem made of a single element. The word “Diamond” comes from the Greek word “Adamas” and means “unconquerable and indestructible.” Even though the diamond is the hardest natural substance found at the Earth. Diamonds were first came upon in India, then in Brazil. The diamond has a wealthy history as the birthstone for April. For the reason that middle-ages, diamonds have been perceived as the normal birthstone for the ones born in April. .Diamond is the one gem made of a single element: It’s generally about 99.95 percent carbon.