Tool and method for cutting a seat in the setting of stones in jewelry

A tool for cutting a seat in the setting of jewelry for receiving a gemstone, said gemstone having a crown, a girdle, and a pavilion, the tool comprising a cylindrical shank portion and a bur cutting portion attached to said shank portion at one end for conjoint rotation therewith, said bur cutting portion having cutting surfaces disposed for rotation about a longitudinal axis of the shank portion, said bur cutting portion including first and second generally conical cutting surfaces and a generally cylindrical cutting surface located between the first and second cutting surfaces, said cutting surfaces each being constructed to cut into the setting of the jewelry upon rotation of the tool about the longitudinal axis of the shank portion to form the seat in the setting, the first and second cutting surfaces each having an inner diameter, the generally cylindrical cutting surface having a diameter substantially greater than the inner diameters of the first and second cutting surfaces, the cylindrical cutting surface having an upper end defining an upper plane transverse to the longitudinal axis of the shank portion and a lower end defining a lower plane transverse to the longitudinal axis of the shank portion in spaced relationship with the upper plane, the cylindrical cutting surface being defined by a plurality of cutting teeth spaced about the circumference of the bur cutting portion of the tool, a portion of each of the plurality of cutting teeth lying in the upper plane and another portion of each of the plurality of cutting teeth lying in the lower plane.