When finishing to fire-place hearths, stone walls and other irregular shaped obstacles with a hard surface floor, the best way to achieve a clean good-looking finish is to under-cut or remove a shallow, narrow section of material from the bottom.
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We've masked the tile off with blue painter's tape for protection. We've also set the height of our undercut saw blade as mentioned earlier and we've set the depth adjustment to the thickness of the tile, which in this case is one-half inch. Notice that most of the cutting dust has been collected through the saw's vacuum port leaving behind the larger debris to be collected using a hand broom (sometimes called a fishtail in the trade) and a final vacuuming. Usually we make two cuts to remove the required material, the first cut is the one just above the thickness of the flooring. The second cut is flush with the concrete subfloor to free the material from any adhesive bond it may have with the subfloor. At that point the pieces will chip away quite easily.