Simply because Agate is really a gemstone the shades can differ significantly with every single stone that is all with respect to the distribution from the minerals within every band. The minerals within the stone are what identify natural colours. Minerals that lead towards the colouring are: iron oxides which produce vibrant yellows, browns, black and shades of eco-friendly, magnesium can give us pinks, violets and once again black, chromium developing stunning colours of eco-friendly, yellow and red-colored, titanium creates a dark blue, cobalt can give use yellows and purples, nickel supplies for us eco-friendly, and copper produces red-colored, blue and awesome shades of eco-friendly.