Thanks for the replies. This stone is NOT a Norton, and I probably should have went that route to get a clear one. I will let you know what the retailer has to say as soon as I hear back from them which will probably be Monday. At this point the stone seems to work very well, it's just that I am not pleased with the discolorization, but that is probably just me being picky and if I am told this is normal by them, then I shall live with it in peace.