K gold (or gold) is an alloy formed by the fusion of gold and other metals. The "k" of K-gold is the compilation of the foreign word "Karat". The complete expression is gold opening (that is, k gold), and "AU" or "G" is an international symbol used to express the purity (that is, gold content) of gold.
K gold will oxidize on the surface and the coating will fall off. When making jewelry, K gold is often coated with a layer on the surface, that is, a film is coated on the surface of jewelry. This is because K-gold porcelain contains other metals, which are not as stable as gold and are easily oxidized and corroded, and the coating plays a protective role.
Treatment method after fading:
K gold jewelry can be washed and electroplated again to restore luster.
Extended data
Mr. Liu bought a 18K platinum ring in the mall, and brought it back to find that it was a 18K gold ring. Mr. Liu, who believed that he had been cheated by the merchants, took the shopping mall to court. This morning, the second trial of the case was held in the First Intermediate People's Court.
Last September 16, Mr. Liu bought a ring worth 14000 yuan in Shuang 'an Shopping Mall in Haidian District. At the time of purchase, Mr. Liu asked about the material of this jewelry. The salesperson replied that it was 18K platinum, and the sales list was also marked as "18K platinum natural topaz ring". After Mr. Liu bought this ring, he gave it to the jewelry appraisal office for testing and found that it turned out to be 18K gold.
After Mr. Liu sued, on July 7 this year, Haidian District Court made a first-instance judgment. The court held that there was a dispute between the two parties over the handwritten "18K platinum" on the bill. On the basis of the existing evidence, there is no fraud in the sales behavior of Shuang 'an Shopping Mall, so the judgment dismissed Mr. Liu's claim. Mr. Liu refused to accept the appeal and appealed to the No.1 Intermediate People's Court.
In court, the appellee Shuang 'an Shopping Mall held that according to China's Regulations on the Purity and Naming Methods of Jewelry and Precious Metals, the precious metal marked "18K" was only gold, and it could not be platinum or other precious metals. And "18K" gold has many colors such as yellow, white and red.
The salesman wrote "18K platinum", which means "white 18K gold". Thirdly, the material of the ring "18K gold" is clearly specified in the attached national inspection certificate, sales voucher, machine-printed invoice and sales list. Therefore, the mall believes that the salesperson's handwriting "18K platinum" on the bill was induced by Mr. Liu, and there is no fraud in the business.
Regarding the behavior of asking the salesperson to write the material of the ring by hand, Mr. Liu argued that he did it because he was not at ease.
At the end of the trial, the judge presided over the mediation between the two sides. Mr. Liu said: "I agree to mediation and ask the other party to refund the purchase price and the expenses during the prosecution and appeal." On the other hand, Shuang 'an Shopping Mall refused to mediate in court. The case was not pronounced in court.
From Mr. Liu's defense in court, it can be heard that he has a very detailed understanding of precious metals such as platinum and gold.
After the court, in an interview with reporters, Mr. Liu called it a lawsuit. He consulted many friends and experts in jewelry business, and also made great efforts to consult a lot of information. At the same time, Mr. Liu strongly denied that he "knew and bought fakes": "Even if I knew and bought fakes, it was protected by law. The Supreme Law stipulates that knowing the fake and buying fake does not affect my rights protection. "
According to the reporter, there is only 18K platinum without "18K platinum", and the former is "impure gold". Platinum is a natural white precious metal, and its price is much higher than that of gold.
People's Daily Online-18K platinum ring is actually gold? The material of the ring is controversial.
Baidu encyclopedia -K gold