Since about 1975 beveled or double beveled diamond anvils have been the standard configuration for achieving multi-megbar pressures in a diamond anvil cell (DAC). Even with this configuration achieving pressures of 4.0 Mbars is not routine. Recently, two techniques have been reported that significantly expand the pressure range that is achievable in a DAC, the double-stage DAC and the toroidal DAC. Here we discuss our recent results with the toroidal diamond anvil design. We used focused ion beam techniques to craft a toroidal surface onto a standard single beveled diamond anvil. The toroidal anvil is well established in the large volume press community, and the toroidal design serves two purposes (1) it sharply reduces the extrusion of the central portion of the gasket and (2) decreases the magnitude of the shear stresses in the anvils themselves. We studied some BCC and FCC metals that are commonly used as pressure standards in high-pressure DAC experiments. We compare EOSs obtained in our ultra high-pressure t-DAC experiments with EOSs reported using other techniques. The toroidal DAC has broad applications to many fields and can be used to study structural, magnetic, electrical, and optical properties of materials.