Rustic Ridge thin stone veneer is a blend of natural Wisconsin quarried limestones.  The blend showcases the range of colors and textures that can be achieved when blending stone from just two quarries.  The flat grey pieces have a smooth texture and show the interior part of the stone which is exposed when split with a hydraulic press.  The gold and blue/grey pieces showcase the bedface (top and bottom) of the natural sheets of stone as they are unearthed.  The gold and blue/grey pieces both have a pimply texture and come from the same quarry and sometimes even the same raw slab of stone.  The color difference comes from the varying mineral composition within the ground.