Just looked at an onyx floor 12x12 tiles with lippage and sanded grout. I can replace the sanded grout ok but never have delipped onyx approx 1/8 lippage and of course some tiles are lower instead of lippage. Customer is willing to pay the price but I'm not sure how it will react to my metal diamonds. Kitchen area 100 sqft. Have removed scratches & polished onyx countertops but not a floor. Thanks Phil