The 1000+ grit sandpaper will dull it, so you will have to follow the sanding with a metal polish, such as Flitz, to get the high shine back. Use a very minimal amount of the polish and be
VERY CAREFUL around the ivory scales with the polish, it turns black and I suspect it might get absorbed and darken the ivory if you get to aggressive with the polish. I know it will do that to stag handles and is less than desirable. I do not have a knife with genuine ivory scales, so I am only assuming that it might absorb some of the black, much like stag. I only wrote this to caution you to at least test it or look closely to see how porous the ivory might be. Some of the others that have ivory handles and that have used metal polish on the bolsters might chime in here - I just do not want to see the member's knife scales messed up, due to not enough information being posted.

P.S. - also try to avoid getting the metal polish down in the arrow on the bolster - it will likely shine the blackened highlights. You could also use the blue painter's tape where the ivory meets the bolsters, but, still be careful around the ivory - it can get under the tape if you are too aggressive.
The way it looks in the picture, just a very small amount of the polish without the sanding would probably hide the micro scratches - or you could just leave it alone, as the bolsters will nearly always get micro scratches, even lightly carried.