Take an old setting bur and grind the point off. Grind it down
just past the edge that cuts the corner for the girdle of the
stone. What you have left is a wheel bur with teeth on the edges
only. (In essence a wheel bur with a safety edge.) With this
you can trim the inside edge of a bezel setting to remove the
wavy edge left from pushing it over the diamond. Cut carefully
as to not remove very much metal. This will leave a smooth even
edge that can be polished easily with a graver.