Green Onyx & What These Symbolises? With its mesmerizing hues and patterns, the green onyx gemstone is a fascinating and engaging stone that has won over many hearts. This semi-precious gemstone is a well-liked option for jewelry designers and gemstone fans alike since it comes in a variety of green hues, ranging from pale pastel green to rich emerald green. Green onyx is a magnificent stone whose unique and delicate patterns are created by the way the stone is framed. Layers of cryptocrystalline quartz are what give onyx, a kind of chalcedony, its characteristic attractive banding and veining patterns. Iron and other trace minerals that are said to be inside the stone give Green Onyx its green hue. The way that Green Onyx catches the light is what makes it so remarkable.