Steel seal is the identity card of gold jewelry. When we do identification, the first step is to look at the steel seal. In many cases, steel seal is an important evidence to identify the authenticity. Steel seal consists of two parts: sanction and purity, and some will add brand name or factory name, which are generally engraved in places that do not affect the appearance.
Among the gold ornaments, pure gold 9999 is more common, because the gold material is soft. Many gold jewelry needs to add some non-gold materials to joints, buckles and other parts to make the jewelry stronger, so the overall purity will drop, and it is difficult to reach pure gold 9999. Generally speaking, the purity of gold bars or some simple styles is pure gold.
How to distinguish the steel seal on different jewelry
1, gold jewelry
Signs engraved on gold ornaments include manufacturer, place of origin and gold content, among which gold content is essential, such as AU, G and gold. It must be noted that KP and GP stand for gold plating, KF stands for gold bag, GF and KGF stand for deposit, and these five stamped jewelry are not gold.
2. Platinum jewelry
The symbol of platinum jewelry is pt, for example, pt999 stands for thousands of platinum, pt990 stands for platinum content of not less than 99%, and Pt900 stands for platinum content of not less than 90%.
3.k gold jewelry
K gold refers to the alloy of gold and other metals, which is characterized by high hardness, strong ductility, low cost, gold value and good metallic luster. According to international standards, K gold can be divided into 1~24k, and the gold content per k is about 4. 166%. Common ones are 24k and 18k, and k is its steel seal mark.
4. Palladium jewelry
Palladium is much lighter than platinum, and its price is less than half that of platinum. Its steel logo is pd. For example, the steel seal of palladium is Pd999, which means that the content of palladium is 99.9%.
5. Silver jewelry
The seal letter of silver jewelry is S. S925, which indicates that the silver content is 92.5%. S990 indicates that the silver content is 99%; S999 is silver with a silver content of 99.9%.