Due to their high level of inclusion, black diamonds don’t shine like other diamonds by reflecting light. Instead, they absorb the light and this gives them their beautiful marble-like, or even metallic look.
Black diamonds are polycrystalline in structure, made up of millions of smaller inclusions bound together and this is what gives them their color. This is why you will also see patches of dark gray appear in some black diamonds.
They make a very unique engagement ring with dramatic flair, and because they are indeed diamonds, they are extremely durable and will last for decades.

Loose Black Diamonds
Mohs hardness: 10 / 10
You will also like: onyx
Looks great in: rose gold / white gold / yellow gold / platinum / silver