Gold Jewelry Mark: Marks engraved on gold jewellery, including the manufacturer, origin and gold content, the jewellery mark is usually engraved on the inner ring of the jewelry, and the necklace is marked at the buckle. When buying gold, you must pay attention to the seal.

Platinum Jewelry Mark: The mark imprinted on platinum jewelry should include the manufacturer, origin and platinum content. For example, a thousand platinum Pt999, containing platinum 999 ‰, Pt990 means platinum is not less than 990 ‰, Pt900 means that the platinum content is not less than 900 ‰.

K gold: The corresponding K number is indicated. The common K-gold jewelry marked "G18K, Au750" in China is 75% gold.

The red gold K-jewelry is made of gold and copper, with a small amount of silver alloy, and the color is reddish. The yellow series of K gold jewelry (referred to as K yellow) refers to the alloy of gold and silver and copper. The gold content can be made into K gold series jewelry with different K numbers, mainly 22K, 18K, 14K, 10K and 8K. . The color of the yellow K gold series jewelry is related to the content of gold in K gold and the ratio of silver to copper.

Palladium Jewelry Mark: The mark imprinted on palladium jewellery should include the manufacturer, origin and palladium content. For example, a thousand palladium Pd999, palladium content of 999 ‰, Pd990 means that palladium is not less than 990 ‰, Pd900 means that the palladium content is not less than 900 ‰.

The silver mark is marked as S925, the silver content is 925‰, the S990 silver content is 990‰, and the S999 silver content is 999‰, which is called the thousand-foot silver.

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