In sedimentary hostrock formed agates from Kentucky belong to the most colourful agates of the world. They are famous for their “Mustard & Ketshup” - colours: intensive yellow in combination with splendourful red, grey and (to the most in demand) jet black in beautiful fortress-like structure let the agate collectors become speechless. Kentucky agates are usually found in the Estill or Powell County, now and then also in the Counties Lee, Madison and Rockcastle. The sedimentary rock, in which they were formed is a limestone of the Border-formation. Agate places of discovery in Kentucky often lie on private area, where collecting is not permitted.

Agates from Jackson County are showing very often yellowish Colors. The “red banded pattern” is very rare within the stones.