This customer used the left over Sawn Height Weatheredge Limestone from the exterior of his home to clad his fireplace.
Outdoors they added black mortar color, but changed up to regular gray mortar (with no color added color) indoors.
They recessed the mortar joints which makes each individual stone stand out more.
The live edge mantle looks good with natural stone.
The last four pictures are the exterior of the same house.
Notice how the darker mortar affects the appearance of the stone as well.
This close up picture shows the darker mortar that was used outdoors. Sawn top and bottom with four sizes all fitting each other with 1/2″ mortar joints.
The beauty of natural stone.