JD.COM Mall sells genuine products. You can complain if you buy a fake. This is a common method to accurately identify the fineness of gold ornaments. If it is gold, it will not change color. If it is made of silver, it will produce silver oxide and turn black. In the case of copper products, bivalent copper salt is generated and green foam is generated. Gold ornaments with gold content above 95% have little surface change when tested with nitric acid.
Gold can be sold as a certificate and bought as a fake. Really, just look at the Shanghai Gold Exchange 1 gram when you buy it. If these brands dare to cheat, AQSIQ will deal with them directly.