As fashion items, black diamonds are less well known than white and other colored diamonds. Some diamond dealers tend to consider them inferior in quality and of limited use and advise caution when buying loose stones, as black diamonds often come with inflated prices.
Features
Black diamonds are "carbonado," sourced in Brazil. You can find it in irregular or rounded fragments, and many of the stones are an unattractive gray rather than black. The lack of a crystalline structure often makes these black stones difficult to polish, according to Black Diamonds, a U.K.-based dealer.
Buying Loose Black Diamonds
According to Black Diamonds, loose black diamonds are quite difficult to buy. Online sources are the most accessible, but Price of Diamonds advises novice buyers to check the length of time the dealer has been in the business and if the company's contact details are genuine. The stones should also have a certificate of authenticity from the Gemological Institute of America, and you should get an independent valuation.
Prices
The price per carat ranges from $650 to $1,800 for loose black diamonds, according to Black Diamonds in the U.K in August 2010. This is only a guide, as prices vary between dealers and depend on the quality of the stones.
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