what is a black diamond?

Answer 1

It's a diamond that may have been color enhanced with radiation or heat treatment, though black diamonds do occur naturally. A lot of gemstones are color enhanced with radiation or heat believe it or not. Black diamonds are relatively inexpensive and common, even if the color occurs naturally. You can purchase a larger stone for just a small fraction of what a white or colorless diamond would cost. It is common practice to color enhance diamonds that have a lot of inclusions so they are not as noticeable to the naked eye and then are able to be sold on the market. Blue, Green, Red, and Yellow diamonds, as well as black are currently very trendy. Diamonds do appear naturally in every color but to find an untreated stone of color in good shape is very rare and would cost hundreds of thousands of dollars and even millions.Naturally occurring deep shades of red, blue, and green are among the rarest.

Answer 2

Black Diamond may refer to:

In geology:

Carbonado, a dark polycrystalline diamond.
A black synthetic diamond, specifically CVD polycrystalline diamonds or HPHT polycrystalline compact diamonds.
A colloquial term for coal.
Black Diamond (passenger train), named for this
As a person:

Leônidas da Silva, Brazilian footballer, known as Black Diamond.
Black Diamond, a Liberian rebel leader.
Penelope Black Diamond, a German big bust model.
Black Diamond, a Hungarian pornographic actress.
As a city:

Black Diamond, Alberta, Canada.
Black Diamond, Florida, United States.
Black Diamond, Washington, United States.
As a company:

Black Diamond Cheese Limited, a Canadian cheese manufacturing company.
Black Diamond Equipment, Ltd., a manufacturer of climbing and outdoor gear.
Black Diamond Coal, a coal mining company.
Black Diamond Strings, manufacturer of guitar strings and accessories.
Black Diamond Income Fund, an oil and gas services company based in Alberta, Canada.
As a building:

The Black Diamond building, part of the Danish Royal Library complex.
In music:

Black Diamond, an album by singer Angie Stone.
Black Diamond, an album by American smooth jazz band The Rippingtons, released in 1997.
Black Diamond, a song by the rock band KISS.
Black Diamond, a song by the metal band Stratovarius.
"Black Diamond", a song by The Replacements from their 1984 album Let It Be
In alpine skiing:

A black diamond symbol (♦) denotes a difficult ski slope, two black diamond symbols (♦♦) denote a very difficult slope.
In technology:

Sony Ericsson Black Diamond, a mobile phone

Answer 3

is a diamond that is rarer than its clear counterpart contrary to the
cost of the clearer flawless ones. I think also much rarer than the pink and blues ones too

Answer 4

http://en.wikipedia.org/wiki/Carbonado

Try this link