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‰.
The manufacturer's seal, such as Jing A, indicates that a certain manufacturer produces.
Basic knowledge of jewelry and jade
At present, the common high-grade jewelry on the market includes diamonds, rubies, sapphires, emeralds and high-quality cultured pearls, while the middle-grade jewelry includes garnet, amethyst, gold and topaz. In the past two years, jade ornaments such as coral, malachite, turquoise and Dongling stone have also become popular.
The identification of true and false gems has always been a concern of consumers. When buying gem jewelry, go to a regular jewelry store or a jewelry counter in a big shopping mall to buy it, and the quality is guaranteed. If you have quality problems or questions, you can consult experts or go to relevant quality inspection agencies for identification.
What kind of gem is the most valuable? We can't generalize this problem, but according to the value and scarcity of natural gems, the precious gems recognized by the international jewelry industry are diamonds, emeralds, rubies, sapphires and emeralds. For orientals, jade is also included. But which gem is the most valuable? It depends on the specific situation. The value of a gem depends on its quality and rarity. In every kind of gem, there will be rare and precious gems. For consumers, they can buy according to their own preferences and purchasing power.
With the popularity of diamonds, people's attention to diamonds is not limited to the identification of authenticity, but the quality classification of diamonds. The 4C principle is usually adopted internationally, namely:
Carat weight: 1 carat equals 200 mg.
Clarity: It is divided into six grades: FL, IF, VVS, VS, SI and I, and the market is mostly Si-VVS.
Color: from d, e, f, LLN and cut: it is divided into very good, very good and general.
Knowing the knowledge of diamond classification is helpful to buy diamonds with reasonable price and high quality.
The quality of colored gems, such as ruby and sapphire, depends on its color, transparency, flaws, cutting and other factors. To clean gems and jewelry, generally take a bowl of warm water, add a small amount of detergent, gently dip it in the water with a small brush, then rinse it with water, then absorb the water with a cloth and dry it with a soft silk cloth. When storing gem jewelry, be careful not to put all the jewelry in one box at the same time, because the gems embedded in the jewelry will rub against each other, which will damage and lose their luster.
Remember the quality standard of a diamond -4C.
"4C" is the yardstick for you to judge the value and quality of a diamond. The so-called "4C" is the abbreviation of four English words beginning with C, which refers to the carat weight, clarity, color and cut of diamonds. You can easily understand the value and quality of a diamond just by appreciating the four points of "4C". Diamond price = weight+color+clarity+cut.
Carat weight
The weight of diamonds is measured in carats. 1 carat = 200mg = 0.2g A carat is divided into 100 parts, each part is called one point, 0.75 carat is 75 points, and 0.09 carat is 9 points. Other things being similar, with the increase of diamond weight, its value increases geometrically; Diamonds with the same weight will have different values due to different colors, cleanliness and cutting.
CLARITY (clarity)
Diamonds are crystallized from mantle magma deep in the earth. After hundreds of millions of years of geological changes, they inevitably contain all kinds of sundries and defects. The color, quantity, size and location distribution of these inclusions have different degrees of influence on the clarity of diamonds. Generally, the internal and surface defects of diamonds and their influence on the brilliance are analyzed with a magnifying glass with a magnification of 10. The clarity grades of diamonds without diamonds are subdivided into LC, VVS 1, VVS2, SI 1, SI2, P 1, P2, P3 * * * 65438.
Color (color)
Diamonds have many natural colors. From precious colorless (white after cutting and grinding), rare light blue and pink to common yellowish. The more transparent and colorless, the more white light can penetrate and become more colorful after refraction and dispersion.
The grading of diamond color is determined by technicians repeatedly comparing the diamond to be graded with the standard color colorimetric stone in the grading environment of professional laboratories. Diamond color * * * is divided into 1 1 grade, which is divided into: d, e, f, g, h, I, j, k, l, m and n in turn.
Cut (cut)
The brilliance of diamond is attributed to its unique high refractive index and high dispersion efficiency. Diamond is the hardest substance. It is indestructible and never wears away. Once it is cut and ground, it will shine forever. The way to judge the quality of diamond cutting is to pick up the diamond and stare at the jumping light at the top. Turner's exquisite diamonds are dazzling, and their brilliance will not disappear because of inlay or different styles. The lathe worker's level is: very good, not bad, just so-so.
What does it mean to have a+sign in the national K song among fans? +symbol
Just add fans.
Oriental Beauty: Brilliant Red
(answer)
What does it mean to have a front end and a back end in the fund? What do you want to see?
The back-end fee is introduced to encourage holders to hold it for a long time.
The longer the holding time, the lower the subscription fee.
If you plan to hold it for a long time, then the back-end charge is a good choice.
What do you mean by a few kilograms of gold? A few kilograms of gold means different gold content. "K gold" refers to the purity of gold. Generally, there are 18K, 14K and 9K gold in the market. "18K" means that the pure gold content is 18, that is, 75% gold plus 25% others. "14K" means that the content of pure gold is 14, that is, 58.5% of gold plus 4 1.5% of other metals. "9K" s refers to gold with a pure gold content of 9/24, that is, 37.5%, plus 62.5% of other metals.
The higher the k value, the higher the gold content, and of course the higher the value. I hope I can help you, and I hope to adopt it!
What does it mean that there is 026 18k on the ring? Is it platinum? We also sell it at the counter … Your ring is marked 18k on the back, which means it belongs to K gold! This is 75% gold. It's usually called a lottery! rose gold
What does it mean to have a k-+ in the for statement in C language? (Completed for (k =-1; k & lt0; K-+)) should be an input error, if for (k =-1; k & lt0; K-+) {}, the compiler will prompt an error: Please enter a complete expression.
Therefore, k-+ is an incomplete expression, which can be modified to k-, which is an infinite loop at this time; It can also be modified to k++, in which case the program is executed once in a loop; It can also be changed to k-+ 1, which is also an infinite loop.
You'll know when you compile it. I hope I can help you.
What does it mean that there is a seal in the CF snail? You don't need that. Although you didn't order it, it is displayed in the application. I don't know what happened.
What do you mean by "guaranteed price" in the film? Guaranteed reserve price
What do you mean by "transfer" in futures? It means that if you do inter-period arbitrage, if the price difference is still unfavorable to you when the delivery month of the near contract is near, and you are a legal person customer and can deliver, then you can buy the warehouse receipt of the near contract and then transfer it to the far month, that is, sell it for delivery in the far month. Through two deliveries, lock in the fixed profit when the spread is greater than the cost at the beginning of arbitrage. It can also be said to be risk-free profit.
Or you say that the warehouse receipt is not a delivery match, but the customer reaches an agreement privately to trade the warehouse receipt (transfer), or transfers the warehouse receipt to other customers in time through cash.
What does it mean to have an sv in the watch? The word "SV" refers to "sapphire vision", which is a brand.