Engagement Rings

WHAT ARE BLACK DIAMONDS?

The fact that they absorb light rather than refract light is the most distinguishable trait. Although they are real diamonds, their internal structure consists of polycrystalline. It's still a pure form of carbon crystal called "carbonado".
Naturally black diamonds are rare and quite expensive.
Most black diamonds on the market today are treated to a certain degree to achieve a uniform black look.
Due to it's composition black diamonds are notoriously difficult to cut and softer than white diamonds. This is clear when inspecting the intricacy of a polished white diamond vs the cut of a black diamond.