Black Agate 10mmBlack colors with some white unstructured lines and circles that run along the length of this gemstone. These lines are often curved and can even appear in a circular fashion. Black Agate comes with recognizable banding patterns and layers that make it one of the most unique and rare forms of agate. Black Agate is one of the most sought after gemstones and attracts so much attention due to its color and the elegance that it transmits in such simple