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en.wikipedia.org/wiki/Carbonado

Carbonado, commonly known as the "black diamond", is the toughest form of natural diamond. ... been found only in the Central African Republic and in Brazil, in neither place associated with kimberlite, the source of typical gem diamonds.

www.leibish.com/frequently-asked-questions-about-black-diamonds-article-563

Mar 2, 2015 ... About black diamonds - are black diamonds real, what are black ... also known as the "Eye of Brahma" was an uncut black stone of 195 carats, ...

www.naturallycolored.com/buying-guide/black-diamonds-value

How come some black diamonds cost $100 per carat and some $3000? ... the stone in an evenly manner so that the diamond simply appears… black.

www.worthy.com/appraisal/diamonds/black-diamonds

As with any diamond or gemstone, value can fluctuate, making it especially important to learn how a black diamond's value is determined before you purchase a ...

www.gemsociety.org/article/black-diamonds

Although called "black diamonds," carbonados are a polycrystalline material. Learn how they may have originated in ancient supernova explosions.

jewelrywiseblog.com/what-you-need-to-know-about-black-diamonds

Jul 5, 2012 ... What exactly are black diamonds? Are they worth ... Like most all colored diamonds, natural black diamonds are extremely rare. They are .... I have Natural black diamonds, varying from 1.3 carat to 2.9 carats per stone. Round ...

4cs.gia.edu/en-us/blog/black-diamonds-what-you-need-to-know

Oct 11, 2016 ... A 5.33 carat (ct) black diamond makes for a breathtaking center stone. A platinum setting with 1.01 carats of colorless diamonds on the shank ...

www.jewelrynotes.com/what-are-black-diamonds-and-should-you-buy-them

There are, however, genuine black diamonds that occur naturally. ... But do you really care what the clarity, color, or cut of the original stone was when none of ...

www.jtv.com/library/black-gemstones.html

Like the LBD, the little black gem – otherwise known as the LBG - is also classic, yet versatile. The varied LBG collection consists of diamonds, pearls, opals, ...

www.wikihow.com/Buy-a-Black-Diamond

A great number of black diamonds on today's market are not real. They are treated stones or simply dark brown or very dark green diamonds. What's a real stone ...