What's wrong with the lead in thousands of gold containing lead

Foot gold. The amount of gold content is not less than 990. It can be called sufficient gold.
Thousands of gold. The amount of gold content is not less than 999. The purity is 99.95%, while the price of thousands of gold is more expensive.

It to buy jewelry is best to buy K gold, because it is not easy to damage the color, and it is cheaper than pure gold
--------------------------------------------------- ----------------------------------- rn每开(英文carat、德文karat的缩写, Often writing "K") gold content is 4.166%, 18K = 18*4.166%= 74.998%, 24K = 24*4.166%= 99.984%
24K contains 99%, 22K contains 91.7%, 18K contains 75 containing 75 containing 75 . 1%, 14K contains 58.5%, and 12K contains 50%.
The gold jewelry currently sold in the market is divided into foot gold and K gold jewelry. According to the provisions of the national standard GB11887, the content of several common gold jewelry is:
24K -the current market occasional label There are 24K gold jewelry. According to national standards, the theoretical value of 24K gold content should be 100 %, and gold has no barefoot. Therefore, it is strictly that 24K does not exist. The sales of 24K gold in sales are incorrect and do not meet national standards.
Thousands of gold -content is 99.9%, commonly known as three 9.
The gold -content is 99.0%, above, commonly known as two 9.
18K — the content is 75.0%. There are many colors of K gold, usually with yellow, red, and white. Among them, white K gold is actually alloy of gold, nickel, zinc, copper and other elements. It is not usually called platinum jewelry. Platinum refers to the expensive metal platinum (PT)
Maipan how to distinguish between true and false and quality when buying jewelry?
. View mark
National standards stipulate that precious metal jewelry should be produced, manufacturers, materials and content marks, and unsproting products are unqualified products. If a quality problem, quality inspection agencies may be given inspection and judgment according to the mark. Consumers should purchase the brand they need and the gold jewelry of different gold content according to the mark.
. Sensory inspection method:
1. Seeing color: Foot gold is dark yellow, K gold has yellow, red, white and other colors, and the imitation gold products are mostly copper alloy with lighter color.
2. 量 weight: The proportion of gold is 19.3g/cm3, which is much higher than the proportion of imitation gold products. For example, a foot gold ring is about 5 grams, and the same size imitation gold products are generally less than 3 grams.
3. Test hardness: Pure gold is soft, scratches with large head needles, bite tooth marks with teeth.
. If you need to accurately know the content of precious metal jewelry or quality disputes, you should go to the jewelry quality inspection institution and use a physical or chemical analysis method for identification. When buying jewelry, you also need to carefully check whether the stones are inlaid, whether the welding is firm or broken, burrs, trachoma, etc.
The maintenance of jewelry: When wearing and stored in gold jewelry, you should avoid contact with items such as lead and mercury (mercury), otherwise the surface of the jewelry will be discolored. Dry the jewelry during drying and bathing to prevent wear or bumps, let alone pull it hard to avoid deformation or broken.
In the jewelry for a period of time, there may be dirt, dark color, soak with a washing spirit, brushing it gently with a soft brush, rinse with water, and wear it after drying.
Brene (platinum) basic knowledge
platinum is also known as platinum. The symbol of the chemical element is PT, which is silver -white precious metal. , Following point 1768. C, it has many excellent characteristics, such as corrosion resistance, antioxidant, and beautiful colors. Because platinum has these characteristics, it can be used to make a beautiful and tough platinum jewelry. The jewelry, especially the white golden base, is inlaid with a flashed with a flashed with a fire color, and the pearl is combined to complement each other. It is currently the most popular jewelry jewelry.
The types of platinum jewelry (common in the market)
PT990 jewelry, also known as foot white gold jewelry, has a platinum content of not less than 90 %.
PT900 jewelry, its platinum content is not less than 900 %.
PT850 jewelry, its platinum content is not less than 80 %.
The mark of Platinum Jewelry:
Materials and content marks: for example: PT900, which means that the platinum content is not less than 900 %.
manufacturer of manufacturer: such as Beijing E, indicating production manufacturers.
diamond weight: such as: d0.26, indicating that the inlaid diamond weighs 0.26 carats.
The consumers should pay special attention to the imprint when purchasing jewelry, and distinguish the platinum (platinum) jewelry from the white K gold jewelry. The white 18K gold mark is 18K, and the platinum (platinum) is PT.
Basic knowledge of silver jewelry
silver, chemical element symbols are AG, which are silver -white precious metals, low hardness, density of 10.5%/cm3, and melting point 960. C, has good conductivity, ductility, and thermal conductivity. In addition to the use of electronics, medical, and photographic industries, it is also used to manufacture currency, jewelry, utensils, etc.
Callow category (common in the market)
S990 foot silver jewelry has a silver content of not less than 990 %.
S925 silver jewelry has a silver content of not less than 925.
The mark of the silver jewelry:
M material and content marks, such as: S925, indicating that the silver content of the jewelry is not less than 925 in thousands of tentures.