Thousands of gold, with a gold content of not less than 999, can become thousands of gold.
Thousands of pure gold is more pure, with a purity of 99.99%; The purity of pure gold is 99.95%, while the price of pure gold is more expensive.
It is best to buy K gold jewelry, because it is not easy to damage and fade, and it is cheaper than pure gold.
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The gold content per carat is 4. 166%,18k =18 * 4.166% = 74.998%, 24k = 24 * 4. 16%.
24K contains 99% gold and 22K contains 9 1. 7%, 18K contains 75. 1%, 14K contains 58. 5%, 12K contains 50%.
At present, the gold jewelry sold in the market is divided into pure gold jewelry and K gold jewelry. According to the national standard GB 1 1887, the contents of several common gold ornaments are as follows:
24K-At present, gold ornaments marked with 24k are occasionally seen in the market. According to the national standard, the theoretical value of 24K gold content should be 100%, and gold is barefoot. So strictly speaking, 24K doesn't exist. It is incorrect to mark 24k gold in sales, which does not meet the national standards.
Thousands of pure gold-the content is 99.9%, commonly known as three 9s.
Pure gold-the content is above 99.0%, commonly known as two 9s.
18k- content is 75.0%. K gold has many colors, usually yellow, red and white. Among them, platinum is actually an alloy of gold with elements such as nickel, zinc and copper. Not just any platinum jewelry. Platinum refers to precious metal platinum (Pt)
How to distinguish authenticity and quality when buying jewelry?
First, check the tag.
According to the national standard, precious metal ornaments should be marked with the origin, manufacturer, material and content, and products without marks are unqualified products. If there is a quality problem, the quality inspection agency can give detection and judgment according to the imprint. Consumers should buy their own brands and gold ornaments with different gold contents according to the imprint.
Second, the sensory test method:
1, look at the color: pure gold is dark yellow, k gold has yellow, red, white and other colors, while imitation gold products are mostly copper alloys with lighter colors.
2. Weighing weight: The specific gravity of gold is 19.3g/cm3, which is much higher than that of imitation gold products. For example, a gold ring is about 5g, while imitation gold products of the same size generally weigh less than 3g.
3, hardness test: pure gold is relatively soft, you can use a pin to draw it, there are teeth marks.
Three, if you need to accurately understand the content of precious metal jewelry or quality disputes, you should go to the jewelry quality inspection agency, through physical or chemical analysis and identification. When buying jewelry, you need to carefully check whether the gemstone is firmly inlaid and welded, and whether there are any fractures, burrs, trachoma, etc.
Maintenance of jewelry: When gold jewelry is worn and stored, it should avoid contact with articles containing elements such as lead and mercury (mercury), otherwise it will discolor the jewelry surface. When working and taking a bath, you should take off your jewelry to prevent it from wearing or bumping, and don't pull it hard to avoid deformation or fracture.
After wearing jewelry for a period of time, there may be dirt and dark color. You can soak it in detergent, brush it lightly with a soft brush, rinse it with water, and wear it after drying.
Basic knowledge of platinum jewelry
Platinum, also known as platinum, is a silver-white precious metal, and the symbol of chemical element is Pt. Its hardness is slightly higher than that of gold, and its density is 2 1.45g/cm3(20. C), melting point 1768. It has many excellent characteristics, such as corrosion resistance, oxidation resistance and beautiful colors. Because of these characteristics, platinum can be used to make beautiful and tough platinum jewelry, and it can also be used to make jewelry inlaid with jewelry, especially the beautiful diamonds inlaid with sparkling fire on the platinum base, which is the most popular jewelry at present.
Types of platinum jewelry (common in the market)
PT990 jewelry is also called foot platinum jewelry, and the platinum content is not less than 990‰.
PT900 jewelry, its platinum content is not less than 900%.
PT850 jewelry, its platinum content is not less than 850‰.
The imprint of platinum jewelry:
Material and content stamp: such as PT900, indicating that the platinum content is not less than 900%.
Manufacturer's seal: e.g. Jing E, indicating that it is produced by a manufacturer.
Weight of diamond: for example, D0.26, which means that the weight of inlaid diamond is 0.26 carats.
Consumers should pay special attention to the imprint when buying jewelry, and distinguish platinum (platinum) jewelry from platinum jewelry. White 18K gold stamp is 18K, and platinum (platinum) is Pt.
Basic knowledge of silver jewelry
Silver, chemical element symbol Ag, is a silvery white precious metal with low hardness, density of 10.5%/cm3 and melting point of 960. C, with good electrical conductivity, ductility and thermal conductivity, is not only used in electronics, medical care and photography industries, but also used to make money, jewelry, utensils and so on.
Classification of Silver Jewelry (Common in the Market)
The silver content of S990 foot silver jewelry is not less than 990 per thousand.
The silver content of S925 silver jewelry is not less than 925‰.
The imprint of silver ornaments:
Material and content stamp, such as S925, indicates that the silver content of jewelry is not less than 925‰.