Cobalt Ashlar combines all our cobalt bedface and splitface rubbles that stack well together to create a wonderful tapestry of shapes and textures, with a mortar joint or in a linear dry stack look. The yellow and white accent colours come from the vegetative and deposit bed faces of the limestone. This product was previously categorised as rubble, but recent finished jobs show the material being laid in a more linear ashlar pattern. If you order this product in thin veneer, it will look more irregular, like the pictures of the fireplace.