  The precise measurement of the gravity of the earth plays a pivotal role in
various fundamental research and application fields. Although a few gravimeters
have been reported to achieve this goal, miniaturization of high-precision
gravimetry remains a challenge. In this work, we have proposed and demonstrated
a miniaturized gravimetry operating at room temperature based on a diamagnetic
levitated micro-oscillator with a proof mass of only 215 mg. Compared with the
latest reported miniaturized gravimeters based on Micro-Electro-Mechanical
Systems, the performance of our gravimetry has substantial improvements in that
an acceleration sensitivity of 15 $\mu Gal/\sqrt{Hz}$ and a drift as low as 61
$\mu Gal$ per day have been reached. Based on this diamagnetic levitation
gravimetry, we observed the earth tides, and the correlation coefficient
between the experimental data and theoretical data reached 0.97. Some moderate
foreseeable improvements can develop this diamagnetic levitation gravimetry
into chip size device, making it suitable for mobile platforms such as drones.
Our advancement in gravimetry is expected to facilitate a multitude of
applications, including underground density surveying and the forecasting of
natural hazards.
