Three different Black Diamond Rings just under and just over the £200 mark. Great value and unusual!
Black diamonds are opaque and although they do not show the fire normally valued in diamonds, they are still required. The colour is caused by an insertion of graphite within the crystal. The graphite insertion cause the diamond to be a conductor.3 Diamond and graphite are both made of carbon, the carbon atoms are attached differently. With the knowledge of this information it is not difficult to understand that graphite may be found in the diamond.
According to new research, Black diamonds found in only a few places on Earth may have crashed down from space in a rock the size of a kilometer.
The diamonds, also called carbonados, are only found in Brazil and the Central African Republic. Unlike other diamonds, they are made of millions of diamond crystals that are stuck together.
They are also porous, which is a puzzle. Scientists say it would have been difficult for gas to become trapped in rocks at depths of about 200 kilometers below the Earth's surface. The intense pressure there turns carbon into conventional diamonds.
"This is the feature that first led some of us to think, well, perhaps there has to be a different alternative," says Stephen Haggerty, a geologist at Florida International University in Miami, US, and an author of the new study.
Because carbonados diamonds have only been found in two places and never in traditional diamond fields, A group of scientists conclude that they crashed down from space to earth. Haggerty believes they came from a large, diamond-bearing asteroid that may have fallen to Earth.
