Precious metal jewelry, including platinum and gold, occupies a very important position in the jewelry family because of its charming color and preservation function. And all kinds of imitation jewelry, including forged gold and covered gold, are favored by people because of their precious metal color, high quality and low price. Imitation jewelry is sometimes passed off as precious metal jewelry by unscrupulous merchants, but the value of the two is far from each other. If consumers look closely, they will find that all kinds of jewelry are engraved with different marks on the inner ring or the reverse side. These signs not only explain the type of jewelry, but also explain the color of jewelry. Here are some introductions:

Pure gold: refers to the gold content of not less than 990. Mark with "Gold", "Gold 990" or "G990".

Thousands of gold: refers to the gold content of not less than 999. Mark "Thousands of Gold", "Gold 999" or "G999".

K gold: Generally speaking, precious metal jewelry with gold content between 8K and 24K (1k = 4. 1666...%) is marked as 24K, 18K, 9K or 750 (i.e. gold content is 75%, also called 18K).

In order to meet the needs of consumers, merchants have also developed and produced lottery tickets of various colors. Color gold is the addition of various other metals into gold, such as aluminum, silver, cadmium, palladium and so on. , make jewelry appear purple, pink, blue, green, gray and other colors. Lottery money is k gold. As we usually see, 18K platinum is often considered as a kind of platinum. In fact, 18K platinum is platinum containing 75% gold, 10% silver, 5% zinc and 5% nickel. Hong Kong and Macao are also called "Dacheng K Platinum" or "33,000 Gold", but they are often confused because of their similar appearance to platinum jewelry.

Foot platinum: the platinum content is not less than 990, and it is marked with "Foot Platinum" or "PT990". 950 Platinum: The platinum content is not less than 950, and it is marked with "Platinum 950" or "PT950".

900 Platinum: The platinum content is not less than 900, and it is marked with "Platinum 900" or "PT900".

850 Platinum: The platinum content is not less than 850, and it is marked with "Platinum 850" or "PT850".

Other substances in platinum jewelry are mainly its kindred element palladium (Pb). For example, PT900 contains 90% platinum, 10% palladium, and so on.

The platinum content in platinum jewelry is generally not less than 85%, and the color mark of silver jewelry is also expressed by one thousandth of the silver content.

Foot silver: the silver content is not less than 990, so it is marked with "foot silver" or according to the actual content.

925 Silver: The silver content is not less than 925, so mark "Silver 925" or "S925".

Gold plating: Using the principle of electrolysis, a thin layer of gold is plated on the surface of jewelry made of silver or copper. In China's industry standards, the thickness of gold-plated layer is not less than 0.5 micron, even if it is thin gold-plated, it must be greater than 0.05 micron, and the gold-plated jewelry is marked as "GP" or "KP".

Gold plating: gold foil is plated on the surface of metallic materials such as silver and copper, and the fineness of 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.

Forging gold: in essence, it is a kind of gold foil forging on the surface of other metal jewelry blanks at high temperature and high pressure. The fineness of gold foil should be greater than 10K, in which the total amount of counterfeit gold is not less than 5% of the finished product, and its mark is "GF" or "KGF". Forged gold has high surface hardness and strong wear resistance, and it is not easy to lose the gold texture.