Polishing, artificial and natural

I use sanding paper for a lot of the finishing work but I found that water stones can ease a lot of the otherwise tedious steps like evening out a fuller or hollow grind.  Some are used before sanding while defining shape while others are good for the final polish after sanding.  Some of the resultant slurries are used right at the end, mixed with a thick oil to round off the final polish.  Here are some of those I have collected at my favourite spots.