Inky jade is a popular variety in jadeite jade recent years. Inky jadeite, usually looks black in usual light, but looks dark green through strong light. It is with high value, and is also believed to be more powerful in Fung Shui.
Black Chicken jade is another variety in jadeite. It is usually black or dark grey. It is not green through light. Some might be with grey or black inclusion.
We can also find black nephrite jade. It is usually black, the color is even, seldom with grey or white inclusion.