Did my first Onyx counter top today and had nothing but issues so I have to go back and redo this. My first mistake was using a set of 7 in. pads which of questionable quality. I am going to order a set of 4 or 5 in. quality diamonds before I go back. I kept ending up with scratches in several areas. I polished using 5x and most of it polished well but had random spots that got a bit burnt. Fortunately I have done Limestone floors, marble counter tops and Terra Cotta tiles for the same client with good results so they are very understanding in this case. Any advice or info on Onyx characteristics would be appreciated.