We propose a current-carrying-chip scheme for generating spatial quantum superpositions using a levitating nanodiamond with a built-in nitrogen-vacancy (NV) centre defect. Our setup is versatile, for a mass range of ${10}^{-19}kg\le m\le {10}^{-17}kg$ a superposition size of range $O(100)nm<\Delta x<O(10)\mu m$ is achievable in $t\le 0.1s$, depending on the position we launch from the centre of the diamagnetic trap. Using numerical simulations, we provide an in-depth analysis of the chip that can support stable trapping of the particle in all three dimensions as well as create a spatial superposition along the $x$-axis, while producing a very tight trap in the transverse directions. This setup enables the creation of a Schr"odinger cat state with a diamagnetically levitated nanoparticle in a table-top experiment. Although the mass and superposition size considered here remain below those required for a QGEM test, the proposed device provides a building block toward future QGEM experiments.