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What’s the difference between 925 sterling silver and platinum?

The properties of 925 silver and platinum are different. 925 silver is a precious metal composed of chemical element silver, and its chemical properties are relatively stable. Platinum belongs to the natural platinum subgroup, which is a naturally formed white precious metal with strong ductility. The reaction of 925 silver is different from that of platinum. 925 silver easily reacts with oxygen, sulfur, nitric acid, nitrogen dioxide, etc., causing its surface to become black. The nature of platinum is very stable, and the reaction with other substances is not obvious. But many friends may not know whether 925 pure silver can be distinguished from platinum with the naked eye, and what is the difference between 925 pure silver and platinum?

Can the naked eye distinguish 925 pure silver from platinum? What’s the difference between 925 pure silver and platinum?

The properties of 925 silver and platinum are different. 925 silver is a precious metal composed of chemical element silver, and its chemical properties are relatively stable. Platinum belongs to the natural platinum subgroup, which is a naturally formed white precious metal with strong ductility. The reaction of 925 silver is different from that of platinum. 925 silver easily reacts with oxygen, sulfur, nitric acid, nitrogen dioxide, etc., causing its surface to become black. Platinum is very stable in nature, and the reaction with other substances is not obvious. The hardness of 925 silver is different from that of platinum. The hardness of 925 silver is about 2.5~3 degrees Mohs and the melting point is 961.93 ℃. The hardness of platinum is about 4~4.5 degrees Mohs, and the melting point is 1772 ℃. In fact, the 925 silver jewelry does not contain 100% silver. That is because the 7.5% alloy added to pure silver improves the luster, brightness and hardness of silver. However, it is more practical than pure silver. Pure silver is easy to darken and blacken due to strong chemical reaction, and 925 silver with special process can improve this problem. The processing technology of 925 silver is different from that of pure silver. Its brightness and luster are closer to platinum, and its hardness is better than that of pure silver. Therefore, 925 silver is widely used in jewelry. It has a unique skin affinity and anti-allergy.

Every piece of jewelry has an industry mark, and Pt is platinum; See S for silver, e.g. S925 for 925 silver. In addition, please note that the silver plating symbol of copper is SF. If the seal is vague or the seal has been cut off, this method can be used. The density of platinum is high, and the weight of silver in the same volume is only half of platinum, so it is easy to distinguish between the two. Sometimes, when there are few materials, the weight on the hand is not clear, and there is no seal, this method can only be used. The color of platinum will not change after heating or fire baking and cooling; on the other hand, silver will turn into wet red or black red after heating or baking and cooling. When mercury is applied to jewelry, it cannot be attached to platinum, otherwise it is silver jewelry. The hardness of platinum and silver is different. Gently pull it. Platinum is hard and not easy to bend. The higher the purity and lower the hardness of silver, the easier it is to be bent, but not broken. Platinum is very stable in nature. It will not fade because of daily wear, nor will it become oxidized and black because it is not worn for a long time; On the contrary, silver is different. Silver is unstable, easy to be oxidized and blackened. And 925 is the symbol of silver content in silver products.

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