Abstract: A method of setting a gemstone having a profile including at least three notch surfaces in a jewelry setting includes the step of cutting notches into the inner surface of each setting prong. Each notch has as least three notch surfaces, each surface being complementary to a corresponding profile surface of the gemstone. The gemstone is set in the setting prongs so that portions of the gemstone profile surfaces are received in respective notches. The gemstone is secured within the setting by manually deforming the setting prongs such that the notch surfaces of each notch substantially conform to the corresponding profile surfaces of the gemstone.

Abstract: A tool and method for cutting a seat in a setting of jewelry for receiving a gemstone having a crown, a girdle, and a pavilion. The tool has a cylindrical shank portion having a smooth outer surface and a bur cutting portion attached to said shank portion at one end for conjoint rotation therewith. The bur cutting portion has cutting surfaces disposed for rotation about a longitudinal axis of the shank portion and includes first and second generally conical cutting surfaces and a generally cylindrical cutting surface located between the conical cutting surfaces. The cutting surfaces are 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 notch that is cut has at least three distinct surfaces, each being complementary to a corresponding profile surface of the gemstone.