1. How to identify 10K Gold! 14k Gold! 18K gold! 22K gold! 24K gold?
Some people’s concepts of 10K Gold, 14K Gold, 18K gold, 22K gold, 24K gold, and pure gold are very vague in daily life. Today, I will tell you their concepts and differences. Gold purity refers to the content of gold. Generally, K is used to express the purity of gold. The purity of 24 K gold is the highest, followed by 18 K, and so on. 18K Gold means that the content of gold is 18 / 24, that is 75%. The remaining 25% is other metals. In gold ornaments, it is usually copper, silver, and so on. 24K gold means pure gold. The name of gold depends on its purity.
The K of gold is directly related to the carat of the gemstone. “Carat” comes from the French carat, “K” comes from the French karat. In French, the two words are read as “carat,” easy to confuse. To distinguish the two, the weight unit of the gem is carat, while the symbol of gold position is K.
The name of gold depends on its purity. For example, gold with a purity of more than 99% is called ” pure gold.”
The method of calculating the fineness of K-gold
Quality = K X 4.166%
8K = 8×4.166% = 33.328% (gold content is 33.3%, national standard is 333 ‰)
9K = 9×4.166% = 37.494% (gold content is 37.5%, national standard is 375 ‰)
10K = 10×4.166% = 41.660% (gold content is 41.7%, national standard is 417 ‰)
12K = 12×4.166% = 49.992% (gold content is 50%, national standard is 500 ‰)
14K = 14×4.166% = 58.324% (gold content is 58.3%, National standard: 583 ‰)
18K = 18×4.166% = 74.998% (gold content: 75%, national standard: 750 ‰)
20K = 20×4.166% = 83.320% (gold content: 83.3%, national standard: 833 ‰)
21k = 21×4.166% = 87.486% (gold content: 87.5%, national standard: 875 ‰)
22K = 22×4.166% = 91.652% (gold content: 91.6%, national standard: 916 ‰)
24K = 24×4.166% = 99.984% (gold content: 99.9%, National standard: 999 ‰)
Most of the K-gold traded on the market are 24K gold, 22K gold, 18K gold, 14K Gold, etc. In theory, only 100% gold can be called 24K gold, but it is impossible to have 100% gold in reality. Therefore, China stipulates that only gold with a content of 99.6% (99.6%) can be called 24K gold. The content of these kinds of gold is the general specification of jewelry, and the gold jewelry with a low 9K cannot be called gold jewelry.
Some people who ignore materials wear 14K and 18K Gold Diamond jewelry. Can’t they afford 22K and 24K gold jewelry? The answer is: 14K and 18K gold jewelry are very popular in western developed countries, with a more than 95% market share. In comparison, 22K and 24K gold jewelry are very rare.
Compared with 22K and 24K gold jewelry,14K and 18K gold jewelry have higher hardness and plasticity. They are not easy to wear and deform and can maintain delicate patterns. Especially after inlaying gems, they are firm and beautiful, showing the precious beauty of gemstones. They can make all kinds of complicated and meticulous gold jewelry designs and create all kinds of shapes.
In the old society, most people paid more attention to pure gold products with good quality when they bought jewelry out of preserving value. With the improvement of understanding and the arrival of the new century, people no longer make the purchase of high-purity gold products as a means of value preservation and investment. More and more consumers have identified with 10K, 14K, and 18K gold jewelry. 10K and 14k Gold jewelry are popular among fashion consumers who pursue fashion.
Here’s how to identify the purity of gold:
1. Look at the color
The higher the purity of gold, the darker the color. The higher the purity, the darker the color.
▪ Deep reddish-yellow gold with a purity of more than 95%;
▪ A pale reddish-yellow gold with a purity of 90 to 95%;
▪ A pale yellow gold color, purity is 80 ~ 85%;
▪ A bluish-yellow gold with a purity of 65 to 70%;
▪ Excellent blue band white gold with a purity of only 50-60%;
▪ Gold is yellowish and white and less than 50% pure.
2. Look at the hardness
In costume movies and TV plays, there is often such a plot that someone uses his teeth to bite gold to identify the authenticity of gold. The hardness of pure gold is low. If you bite with your teeth, it will leave teeth marks. Therefore, when identifying pure gold, you can try its hardness. If the hardness is too high, it can’t be pure gold. (except 3D hard gold)
3. Burn with fire
Fire the jewelry and observe the color change after cooling.
▪ If it is pure gold, the surface is still golden yellow after burning;
▪ If the color turns black, it’s not pure gold.
However, when burning, be careful not to burn jewelry deformation.
4. If you drop gold jewelry on the ground, it will make a click.
▪ The fake or poor quality gold will make a sound when it falls on the ground, and it will jump after landing
2. What kind of gold is rose gold?
Rose gold is an alloy of gold and copper. It is widely used in jewelry design and Processing because of its fashionable and beautiful rose-red color. Also known as pink gold, red gold. Because this metal was once popular in Russia in the early 19th century, it is also called Russian gold, but the term is rarely used now
The composition of rose gold is: pure gold + copper + silver / zinc. Because its synthesis proportion is moderate, it has strong flexibility, high hardness, and changeable colors. At the same time, it integrates 25% of other metals, which has high hardness and is not easy to be deformed or scratched. When it is used in the design of precise and delicate gold ornaments, it can give full play to the complex and exquisite design creativity.
According to reports, the plasticity of K-gold is very strong, and the gold wire drawn by modern technology is thinner than a human hair. Besides, K-gold ornaments with gorgeous appearance have complex processes and complicated production processes, which need to be processed and woven by professional machines. Therefore, K-gold ornaments with exaggerated shapes and styles are much more expensive than ordinary 18K gold.
Rose gold, from her romantic name alone, can cause countless beautiful associations. After sparkling gold jewelry and classic elegant platinum jewelry, the soft and charming rose gold ornaments gradually become fashionable people’s “new favorites.” With her unique style and culture, a new world of precious metal ornaments is deducted. Rose gold is usually composed of 75% gold and other alloys (commonly known as tricolor gold). The hardness is higher than that of pure gold. Compared with traditional gold and platinum, pink rose gold can make the color of colored gems more intense and reflect the delicacy and delicacy of metal materials. In style, there are various shapes, such as heart, olive, oval, pear, and emerald. All kinds of different jewelry styles can be said to be dazzling, whether women are wearing professional wear, or evening dress and suspender skirt, matching with it show elegant temperament.
It is said that pink rose gold first appeared in the late Victorian period. At that time, jewelry designers used warm color metal to inlay gems and reliefs or made brooches and other accessories. Now it has developed new ideas in the popular ecological theme and jewelry design and production technology in the fashion field. Pink rose gold, not only a symbol of love but also contains warm and meaningful feelings — with a pure heart to build, is the best gift for the other half.
Although the names red gold, rose gold, and pink gold can be used interchangeably. There are differences in copper content among the three kinds of gold — the more copper there is, the heavier the red there is. Because pure gold is golden, pure copper is rose red. The standard rose gold is 18K gold with 75% gold content. As rose gold is a gold alloy, the so-called “pure rose gold” is incorrect.
At present, there are three kinds of rose gold content formula commonly used in the world as follows:
1. Crown gold, with a gold content of 22K (91.667%), was first used in gold coin casting by Henry VIII (1526)
2. The most common and typical 18k rose gold is also in 18k (75%), but others contain about 4% silver and 21% copper, showing a beautiful light pink rose color
3. 14K red gold, the content of gold is 14K (58.33%), the other metal is copper (41.67%).
Rose gold jewelry is popular in the international jewelry industry because of its gorgeous and elegant color. At present, there are two kinds of rose gold jewelry in the jewelry market.
1. The jewelry matrix is made of a rose gold alloy, and rose color belongs to its natural color
2. The jewelry substrate is another K gold alloy, and the surface layer is electroplated with rose gold. Rose gold-based jewelry, the process is complex, so the cost is relatively high, more common in high-end brand jewelry. At present, the rose gold electroplating process is a stable, simple operation, excellent profound plating ability and uniform plating ability of solution, and low cost. It can get the popular rose gold, bright and consistent color, and has an excellent decorative effect. So it is widely used in the jewelry processing industry.
3. Why is K-gold jewelry so popular?
What is K-gold?
K-gold refers to the alloy of gold and other metal elements. Specifically, the k-system unit is the gold measurement unit divided by 24 equal parts of gold content. In other words, as long as it is marked by K, whether it is yellow or white, it refers to the content of gold; the highest K gold is 24 K gold, which is pure gold.
Also, 18K, 14K, and 9K are common. The content of gold in 18k gold is 18 / 24 = 75%, indicating that the gold content is 75%.
The reason why K is expensive
- K gold is of better quality than gold
Usually, a small number of other metals will be added to the gold to increase its strength and toughness. It is suitable for complex processing to produce fashionable, exquisite, and gorgeous styles. It is what we often call K-gold. K-gold has high hardness, small toughness, high brightness and is not easy to deform and wear. It can make more designs and has many styles, but its price is relatively low (compared with platinum). K gold mainly lies in the design cost, that is, the labor cost. These hidden costs will eventually be reflected in the retail price. Besides, it can more firmly fix diamonds, unlike gold, which is easy to deform because of its hardness and wear resistance, so inlaid jewelry and diamond rings like K-gold.
In Europe, people prefer K-gold jewelry because the design of K-gold jewelry is more exquisite, fashionable, and changeable.
Gold can’t stand complicated technology.
The gold texture is too soft, can not bear too delicate processing, and makes traditional styles. Such as dragon and Phoenix bracelets, large necklaces, large pendants, and other types that are not easy to deform and damage.
The color of K-gold is changeable, which can meet customers’ needs who like different colors according to different formulas. It is fashionable and highlights personality, simple but not monotonous. For example, in 14K, there are 6 kinds: red, reddish-yellow, dark yellow, light yellow, dark yellow, green-yellow; in 18k, there are 5 kinds: red, reddish, yellow, light yellow, dark yellow. Everyone can choose different K-gold colors and styles according to their skin color, age, and hair color, so there is a great choice.
Color K-gold is mainly produced by alloy smelting. For example, 18K gold is made by smelting “75% gold and 25% other metals”. The 25% other metals can be silver, copper, iron, lead, zinc, nickel, etc. Different proportions of precious metal combinations will affect the color of K gold.
2. A single color of gold
Because the gold content is too high, it can only present a kind of gold color. But modern technology has injected new life into gold. Besides, gold has an unshakable position in China.
3. The process is complicated.
K gold has to go through more than ten processes (wire drawing, heat treatment, electroplating, etc.). The finished product is delicate, fresh in appearance, vital in a light sensor, and very exquisite and gorgeous. Processing personnel is more professional, and the cost and management expenses are also increased. So the cost of K gold will be higher than that of ordinary pure gold.
4. K gold face big gold light
Due to the advantages of design and technology, the jewelry made by K-gold is large in volume, changeable in style, and very good in decoration effect. However, it is light in weight, low in unit price, and high in cost performance. It is more and more popular with fashionable women. All K-gold jewelry in regular stores is marked with grams.
4. Why does gold turn white, black, rust, and fade? Is it a quality problem?
Gold, commonly known as gold, chemical element symbol for Au, is a kind of metal with yellow luster. Gold has good physical properties, stable chemical properties, high flexibility, and rare quantity. Its physical and chemical properties are very durable! But!!! Is it a quality problem why gold turns white, black, rusty, and faded? Don’t worry, the answer, it’s not a quality problem!!!
Now some people are in contact with more and more cosmetics and daily chemical products. Some cosmetics contain trace mercury. When using cosmetics, if you accidentally touch gold jewelry, it will turn white and generate “gold, mercury, and gold.”
Besides, suppose one finger of the same hand is wearing a gold ring. The adjacent finger is wearing a platinum ring due to the frequent movement of the finger. In that case, it is easy to cause mutual friction between the gold ring and the platinum ring. The gold jewelry surface is partially rubbed with platinum and turns white. This kind of situation can’t be eliminated by heating it with a gasoline spray wheel. The melting point of platinum is several hundred degrees higher than that of gold. When gold melts, platinum is still “immobile.” For such white gold jewelry, you can use an agate knife to polish it, or you can use thick cloth (such as canvas) to rub it hard so that the gold can be restored to brightness.
1.Why does gold turn black?
Some cosmetics or hair dyes contain trace amounts of lead. Gold is easy to blacken when it comes to lead. It can be heated with a gasoline spray wheel for jewelry processing because the melting point of mercury and lead is very low. It will volatilize in the spray wheel heating process so that the gold jewelry will return to its original appearance. Of course, it’s best not to wear gold jewelry when wiping cosmetics or dyeing hair to avoid future troubles.
The discoloration or fading of gold jewelry is closely related to the sweat of the human body. 99% of human sweat is water. The other 1% is waste and harmful substances in the human body, such as chlorine, lactic acid, urea, ammonia, etc. When these substances come into contact with silver and copper in gold jewelry, they react to produce silver chloride and copper sulfide and present a dark black chemical salt. These chemical salts often fall from gold jewelry and pollute the wearer’s skin, leaving noticeable black stains on the skin. Consumers can let businesses fire gold ornaments at high temperatures. If it is pure gold, it should be able to restore its original color
2. Why does gold rust and fade?
Why do the gold ornaments and gold bars and coins bought in jewelry stores appear yellow-brown spots? In the process of jewelry production, the iron filings left by the iron processing tools are formed by moisture, which is not a quality problem. Just clean them. Some cosmetics also contain some fine hard particles, forming another type of dirt and wearing gold jewelry. The factors of the regional environment may also make gold jewelry lose its bright color. For example, in dry areas, the air contains more fine dust, which will form a kind of “human sandpaper” after being contaminated with the human body. It can abrade the gold jewelry into excellent debris and produce local black stains. It is worth mentioning that talcum powder or moisturizer also contains similar particles, such as gold jewelry will be eclipsed.
Gold jewelry is not very delicate but not careful maintenance. It will lose its original luster and charm. Generally speaking, the following points should be noted:
1. Detergent chemicals can change the color of gold, so you should take off gold jewelry before cleaning.
2, avoid direct contact with perfume, hair gel, and other high volatile substances. Otherwise, it will quickly lead to fading of gold ornaments.
3. When swimming, take off the gold ornaments to avoid chemical changes on the surface after touching the seawater or pool water.
4. Wrap it with flannelette before putting it into the jewelry box to avoid mutual friction and damage.
5. Gold is soft and easy to deform, so don’t pull to avoid deformation.
6. Pure gold jewelry will have a chemical reaction when meeting mercury, and white spots will appear. When cleaning, you barbecue under the alcohol lamp for a while; you can restore the original color.
7. After wearing, the gold ornaments often lose luster due to stains and dust. At this time, just put the gold ornaments in a neutral detergent, soak them in warm water and clean them, then take them out and wipe them dry.
8, protect the luster of gold jewelry; you can smear a layer of nail polish on it.
9. If there is a black silver film on the surface, Put the gold jewelry in a bowl and pour in the cleaning agent. After 2 hours, please take out the gold jewelry, rinse it with water (preferably not hard water), dry it in sawdust, and then wipe it with a soft cloth.
10. For a ring with gems, roll a piece of a matchstick, wet it in the mixture of toilet water and glycerin, scrub the gemstone frame, and then polish the ring with a flannelette. Do not use sharp objects such as blades to scrape.
11. Salt and vinegar are mixed to form a cleaning agent, which can be used to wipe pure gold jewelry for a long time.
12. Toothpaste or hot rice soup can also restore luster. Pure gold jewelry is made of high-purity gold with low hardness. When wearing it, avoid colliding and rubbing with hard objects.