Black Diamond Necklace - Black Diamonds are of Carbonado Variety. Carbonado, commonly known as the "black diamond", is the toughest form of natural diamond. It is found primarily in alluvial deposits in the Central Africa Republic and in Brazil. Its natural color is black or dark grey, and it is more porous than other diamonds. Carbonados have been dated from 2.6 to 3.8 billion years old, which also might explain why they have only been found in Brazil and in the Central African Republic. During that span of the Earth’s history, what is now Brazil may have been joined to the western coast of Africa. (This “supercontinent” pairing actually preceded the better-known Gondwanaland). It is possible that a diamond meteorite struck the Earth at that time, accounting for Carbonado’s current distribution. Incredibly beautiful gemstone black, moreover, very mysterious. As you know, white and colorless diamonds mined deep underground, while the black diamond or black diamond, and are almost on the ground in the uppermost layers. This design is simple, classic, elegant, fit for any occasion, for daily wearing at home and office. Carefully packed in beautiful jewelry box. Absolutely a great gift for mother's day, valentine's day, wedding, your girlfriend, wife, daughter, family or just a friend, etc.