When bead or pave setting, cut the seat with a setting bur one size smaller than the stone. By using a setting bur, it is easier to see how deep the stone will set and to keep them even. Then, take a hart bur the size of the stone and cut the seats. By using a hart bur, the beads are undercut slightly. When the stones are in place, the metal is already over them and you do not need to move the metal as far to tighten them.