A smart gemstone and a preparation method thereof, according to which the smart gemstone is divided into a base made of gemstone materials and a gemstone itself; the base has a cavity for accommodating a smart control unit and a wireless recharging battery. The gemstone itself is positioned on top of the base and seals the cavity. The structure of the smart gemstone is simple and compact and also high integrated. The smart gemstone has a wide scope of applications. The smart gemstone can emit lights, perform wireless power charging, provide incoming call alerts and allow associated settings. Also, it is water-resistant even in deep water.