These Green Onyx from West Java have some wonderful bands of light red, greenish yellow and greenish translucent. Often called the “earth rainbow”, it is formed with bands of microscopic quartz crystals, though the color of onyx varies depending on the type, this popular stone long remarked for its beauty can be identified by its signature bands and translucent luster. Onyx forms as a result of igneous rock marrying with the silica deposits in groundwater. The colorful bands that give the semi-precious stone its trademark bands are layers of deposits that develop on top of each other. Green Onyx is one of the most highly praised banded stone in the world. It is known for its extremely tight banding and vibrant shades of colors.