If they are deep and you really want to fix it, Starrett can regrind and lap it. I checked into it once, and as I recall the expense wasn't that great. On a small plate like that, shipping wouldn't be bad. All up to you on how much you want to invest.
I have seen people put JBWeld, epoxy, and even a floor leveling compound in a hole. I wouldn't go that far, but if it is the appearance that is the issue, and the gouges are small, epoxy would suffice, but of course be much softer than the granite and wear quicker.