Agate occurs in wide range of colors and patterns. Although some colors occur more commonly than others, almost all agate will be multicolored due to unique banding. Single-colored agates can occur naturally, but most of the stones available today have been dyed to obtain unicolor. Single-colored agates are often traded using specific trade names, such as sard and carnelian. Agate colors can include black, white, blue, red, green, yellow, orange, brown, pink, purple and gray.