1. Hard gold is actually physical gold, but it is "hard" gold made in a new way. Its texture is harder than ordinary gold. Also known as "thousands of gold". "3D hard gold" jewelry is a new product which breaks the traditional craft and mainly focuses on electroforming. The gold content of 3D hard gold is 99.9%, which is consistent with the purity of ordinary pure gold 999.

2. Soft gold is high purity gold, and hard gold is other metals. Usually synthetic gold and copper are mixed together, and pure gold is too soft to be inlaid. The ionization potential of gold is very high, so it is difficult to convert external electrons into positive ions and accept electron anions. Its chemical properties are stable and its affinity with other elements is weak. Therefore, in nature, this is almost simple. In other words, natural gold exists, so its purity is slightly worse than that of hard gold.