Forging gold is essentially a kind of gold coating, which is to forge gold foil on the surface of other metal jewelry blanks at high temperature and high pressure. The fineness of gold foil shall be greater than 10K, in which the total amount of forged gold shall not be less than 5% of the finished product, and marked with "GF" or "KGF". Forged gold has strong surface hardness and high wear resistance, and it is not easy to lose the gold texture.
Gold jewelry is usually engraved with purity marks to indicate the type of gold. "GF" or "HGP" means that jewelry is not pure gold, but gold-plated. Pure gold ornaments can be engraved with "24K" or other symbols indicating purity. The purity mark is usually located inside the ring or near the lock of the necklace. The purity mark may be so small that you need a magnifying glass to see it clearly. ?
Common jewelry characters are G24K, G 18K, PT900, PT950, Pd999, S925, etc. Respectively representing gold, gold, platinum, palladium and silver. Jewelry engraved with the words GF and KP cannot be called precious metal jewelry, but belongs to imitation jewelry.
Imitation jewelry has low cost and similar color to precious metal jewelry. It is inevitable that genuine manufacturers will appear in the market. Consumers must pay more attention. When buying precious metal jewelry, they must check their marks. If you see signs like GP, KP, KF, GF and KGF, then you will definitely buy imitation jewelry. Be careful.
Other purity marks
1. Gold plating: According to the principle of electrolysis, a thin layer of gold is plated on the surface of jewelry made of silver or copper. China's industry standard is that the gold-plated layer should be not less than 0.5um, even if it is very thin, it should be greater than 0.05um, and the gold-plated jewelry should be marked with "GP" or "KP".
2. Gold plating: Gold foil is plated on the surface of metallic materials such as silver and copper, and the fineness of the gold foil is required to be not less than 10K, and the weight is not less than 1/20 of the total weight of the material, usually expressed by KF.