Pretty bowl. The colors remind me of colors used by Seguso AV and Livio Seguso for several of their pieces.
I have had several nice pieces that had gouges in the ground bottom. There are certain Seguso (particularly Archimede) sommerso designs that I even expect to see gouges on the bottom. What you're describing sounds a little different, though, like the polishing was done in two plains. If so, it could have been done when it was made or a later to repair a chip. I have seen some repairs that would have been best to do without.