First of all, I can definitely answer that 3D pure gold is gold, and the gold content of 3D hard pure gold is 99.9%, which is consistent with the purity of ordinary pure gold 999. The "3D" of 3D hard gold is the abbreviation of 3D, which means three-dimensional graphics. Real three-dimensional space, with real distance space. It is also gold, but the new generation of 3D hard gold uses different techniques in different positions, some are polished and some are frosted, resulting in a contrast between light and dark. The layering of colors is clearer, the three-dimensional sense is stronger, and the texture is different. In terms of hand feel, some places are smooth and delicate, and some places are slightly matte and rich in hand feel. The hardness of 3D hard gold is four times that of ordinary pure gold, and it is not easy to deform. Because it is hollow, it is lighter and more comfortable to wear.