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Black diamonds are a rare type of diamond that are characterized by their black color, which is caused by high concentrations of graphite or other inclusions within the diamond's structure. They are considered a fancy-colored diamond and are known for their unique, often metallic, luster.

Here's a more detailed look at black diamonds:

What they are:

Natural Diamonds:

Black diamonds are naturally occurring diamonds, formed under the Earth's crust, just like other diamonds.

Inclusions:

Their color is due to a high concentration of inclusions, primarily graphite, but also pyrite or hematite.

Carbonado:

Some black diamonds are referred to as carbonados, which are a type of polycrystalline diamond with a high density and micro-porosity.

Differentiated from other diamonds:

Unlike typical fancy-colored diamonds, black diamonds only have one color grade, "Fancy Black".

Lab-created:

Black diamonds can also be created in a lab using similar processes to produce other colored diamonds.

Appearance and Properties:

Color:

Black diamonds range in color from deep charcoal to brown-black.

Luster:

They exhibit a unique metallic luster, often described as having a mysterious, elegant look.

Surface:

Black diamonds may have a bumpy or irregular surface, unlike some other diamonds.

Hardness:

They are still very hard, scoring a 10 on the Mohs scale, making them durable for jewelry.

Density:

Black diamonds are denser than colorless diamonds, meaning a one-carat black diamond will appear smaller than a one-carat white diamond.

Rarity and Value:

Rare:

Black diamonds are considered rare, with only a small percentage of all natural diamonds being fancy-colored, and even fewer being black.

Valuable:

Due to their rarity, especially untreated carbonados, black diamonds can be quite valuable.

Price:

The price of a black diamond can vary significantly depending on whether it's natural or lab-created, as well as its size and quality.

Symbolism and Use:

Symbolism:

Black diamonds are often associated with transformation, rebirth, and inner strength.

Jewelry:

They are popular choices for unique jewelry pieces, including rings, necklaces, and bracelets.