water stains

My new "granite" counter top has water rings from where a glass was sitting on it.  When my husband purchased them, nobody told him he needed to seal them.  They are sending someone to buff out the stain tomorrow.....will this work?   Then, it gets worse because as I was clearing the counter for the buffing tomorrow, I dropped a heavy piece of crystal and chipped the same section of counter.  Can they buff that as well or is all of this just going to be a mess??  The color is "Blue in the night", which is black with blue flecks in it.