Gold jewelry related knowledge

Duane

September 20, 2022 at 7:48 pm

Summary of the relevant knowledge of gold jewelry (For details, you can go to the Golden Sister.com to see!)
(1) See the mark: Now the gold jewelry produced by manufacturers in my country is all purified according to international standards. K to indicate the amount of gold in metal products. Foot gold is 24K, and the gold content is 99.6 %; 22K gold content is 91.3 %; the gold content of 20K is 83.3 %; the gold content of 18K is 74.7 %; the gold content of 14K is 58.5 %; It is 37.5 %; the gold content of 8K is 33.3 %; the gold content of 1K is 4.166 %. According to the words of 24K or 18K on the mark, you can know how the jewelry is in color, but the mark of K gold cannot be used as below 10K as regulations.
(2) See color: The higher the purity of gold jewelry, the deeper the color. As people often say "seven blue, eight yellow, nine purple and ten red", that is, if the gold decoration is blue yellow, the gold content can reach 70 %; the yellow content of yellow can reach 80-90 %; if it is red, the gold content can reach 95 or more. Of course, it is not enough to distinguish the color and true and false of gold jewelry by color.
(3) Type weight: The proportion of gold is 19.3, which is higher than other metals. The same volume of gold is 1.8 times the weight of the silver and 2.2 times the copper. Therefore, the real gold bearing should feel heavy in hand, and fake gold feels lighter.
(4) Listening to the sound: throw the gold jewelry to the desktop, or throw it on the hard ground. The lower the gold content, the greater the elasticity, the higher the jump, the crisp sound, and there is a tone; the higher the gold content, the higher the content of the gold; The smaller the elasticity, the lower the jump, the sound of the sound is low, heavy, and no sound.
(5) Testing hardness: The higher the gold content of the jewelry, the softer the more soft, and it is easy to bend with your hands, good toughness, and not easy to break. You will leave clear scratches with hard things; the lower the gold content, the harder it will be. It is necessary to use a large strength to bend, and it is easy to break. When the hard things are engraved, the scratches are not obvious.
(6) Scientific test: First, use fire to identify. Put the jewelry in the smoke -free fire, and the color is unchanged after the pure gold is burned; The second is chemistry. With a concentration of 45 % or 70 % sulfuric acid, the gold has no change and keeps the original; the silver becomes black; Because metals such as silver and copper are dissolved in acid, chemical reactions will occur.

How to prevent gold jewelry from changing color
Peremia after wearing gold jewelry, finds color change or fading. Many people think that this is the insufficient color of gold jewelry, so the store negotiates or goes to consumers to go to consumers The association complained, but the defendant's gold jewelry faded was not the insufficient color of gold jewelry, but for other reasons. So what are the reasons?
The discoloration or fading of gold jewelry is closely related to the human sweat. 99%of human sweats are water, and about 1%are waste and harmful substances in the human body, such as chlorine substitutes, lactic acid, urea ammonia, etc. After contacting the silver and copper in gold jewelry, these substances will produce chemical reactions, produce silver chloride and copper sulfide, and show dark black chemical salt. This kind of chemical salt is often dropped from gold jewelry to pollute the skin of the wearer, leaving a very obvious black stain on the skin.
The cosmetics are also one of the indispensable "characters" for people's lives. If you apply it on the skin of the gold jewelry, it will undoubtedly provide opportunities for cosmetics containing chemicals and the golden jewelry that is most afraid of chemical erosion, and the result can be imagined. Some cosmetics also contain some fine hard particles, which can form another type of dirt, thereby wear gold jewelry. Regional environmental factors may also make gold jewelry lose their bright color. For example: dry areas, the air contains more fine dust. After the human body is contaminated, it will form a "human sandpaper". It can wear gold jewelry to erode extremely fine debris and local black stains. It is worth mentioning that the refreshing powder or moisturizing cream also contains similar particles, which will also make gold jewelry barely like the above.
gold jewelry maintenance
gold jewelry is priceless and eternal. For thousands of years, countless people have been attracted by the charm that it never disappears. Although gold jewelry has various colors, improper handling will make it lust. Here are a few points to save gold jewelry.
I. As precious metals, gold jewelry usually does not lose gloss, color loss or pollution due to the pollution of soap, sweat and other items in daily applications. In fact, ordinary daily oil use also reduces the brightness of gold jewelry. So it is best not to apply perfume or cream before wearing gold jewelry, because it may have an impact on it. Also, gold jewelry should be removed before washing your hands to maintain its luster.
is also a good choice for jewelry cleaning cotton cloth today. It not only protects the jewelry from pollution
, but also makes it like new. So there must be enough cloth to wipe off the dirt. Avoid jewelry contact with soapy water and chlorine -containing water.

Golden jewelry purchases
In except for the purchase of large stores that ensure quality, the following four points should be paid for:
1. There must be formal tax invoices, Seed: the name of the jewelry, the color, and the weight. In order to query in the future;
2. Buy according to the age, temperament, body shape and purchase motivation of each person. At present, the jewelry sold in the stores is mostly jewelry in Shenzhen and Guangzhou. It is characterized by novel and beautiful styles, but the purity is not necessarily high; as well as jewelry produced by Zhejiang, the style is relatively traditional, but the gold content is relatively high; r; r; n3 should be carefully checked whether the jewelry is safe, the chain body is straight, buckle, joint, ear clip, etc. In order to make the buckle of the bracelet, the connector of the earrings, and the head of the head, the color of these parts is lower;
4. The jewelry will sometimes turn white. In contact with the phases such as dishwashing or module, chemical reactions occur, so you should also contact the cosmetics during the wearing process. Once you occur, you can request the store to solve it with the invoice. When storing jewelry, it is best to use a soft cloth to pack each piece separately, so as not to rub each other and cause losses.

Golden jewelry identification
The identification of gold requires certain experience. Simply introduce some identification methods. But it is best to go to the gold shop!

(1) See color: the higher the purity of the gold jewelry, the deeper the color. If there is no gold medal, you can determine the general color according to the following color (based on green gold. The so-called green gold contains only silver ingredients in gold); dark red yellow color is more than 95 %, light red yellow 90-95 % The pale yellow is 80-85 %, the cyan is 65-70 %, and the white light is only 50--60 % white light. The slightly yellow and white are less than 50 %. Generally, Qiqing, Eight Huang, and Jiu Chi can be used as a reference. (2) Type weight: The proportion of gold is 19.32, which is more important than metal such as silver, copper, lead, zinc, aluminum. The volume of gold is more than 40 % heavier than the silver, 1.2 times heavier than copper, and 6.1 times heavier than aluminum. The gold jewelry should have a feeling of sinking in the hand, and the fake gold jewelry feels lightly. This method is not suitable for gold jewelry inlaid.

(3) Look at the hardness: pure gold is soft and low. It can draw light marks with nails. Teeth bite can leave tooth prints. High -colored gold jewelry is low and soft, with copper with copper, contains copper containing copper, contains copper containing copper The harder, the harder, the bending method can also test the hardness, the pure gold is soft, it is easy to bend, the lower the purity, the less likely to bend.

(4) Listening to the sound: Real gold with a color of more than 99 % throwing it on the hard ground, it will make a tap sound, there is no rhyme or elasticity. The fake or low golden sound is crispy but no dullness. Generally, the sound of "Dangdang" is emitted, and there are surplus sounds.

(5) Burning with fire: The jewelry will be burned red (do not melt the jewelry) with fire (do not melt the jewelry), and observe the color change after cooling. Dark or different degrees of darkness is not pure gold. Generally, the lower the color, the stronger the color, and the darkens are all, indicating that it is a fake gold jewelry.

(6) Seeing the mark: Domestic gold jewelry is allicized and prepared according to international standards, and the killing records, such as "24K" indicate "foot red" or "foot gold"; The word "18K" is marked, and those who have a lower color are lower than LOK. At present, illegal elements are commonly used to manufacture fake cards and imitation stamps in the society. They use rare gold, Asian gold, and even brass to impersonate real gold. Therefore, the identification of gold jewelry must be comprehensively determined according to the sample to determine the true and false and the quality of the real.

The accurate identification of gold jewelry in accurate commonly used common methods.

(1) Testing gold stone method: Select the black test gold stone with delicate texture, use the standard tasting films with different gold content (on the gold medal) on the test gold stone, and then put the gold jewelry sample you want to identify in The scratches on the same goldstone, drip the concentrated nitric acid to remove the impurities, and find the traces left on the test gold stones compared with the traces of the tested slices. The accurate gold content of gold jewelry samples to be determined.

(2) Chemical method: also known as reagent test method. Gold is insoluble in separate nitric acid, sulfuric acid, and hydrochloric acid, and silver and copper ingredients can be dissolved with nitric acid. Take gold decorative sample. Putting nitric acid on a certain part, if gold will not change color, if it is silver products, it will generate silver oxide and turn black; For gold jewelry with a gold content of more than 95 %, test with nitric acid, the surface changes very small.

2 thoughts on “Gold jewelry related knowledge”

Duane
September 20, 2022 at 7:48 pm

Summary of the relevant knowledge of gold jewelry (For details, you can go to the Golden Sister.com to see!)
(1) See the mark: Now the gold jewelry produced by manufacturers in my country is all purified according to international standards. K to indicate the amount of gold in metal products. Foot gold is 24K, and the gold content is 99.6 %; 22K gold content is 91.3 %; the gold content of 20K is 83.3 %; the gold content of 18K is 74.7 %; the gold content of 14K is 58.5 %; It is 37.5 %; the gold content of 8K is 33.3 %; the gold content of 1K is 4.166 %. According to the words of 24K or 18K on the mark, you can know how the jewelry is in color, but the mark of K gold cannot be used as below 10K as regulations.
(2) See color: The higher the purity of gold jewelry, the deeper the color. As people often say "seven blue, eight yellow, nine purple and ten red", that is, if the gold decoration is blue yellow, the gold content can reach 70 %; the yellow content of yellow can reach 80-90 %; if it is red, the gold content can reach 95 or more. Of course, it is not enough to distinguish the color and true and false of gold jewelry by color.
(3) Type weight: The proportion of gold is 19.3, which is higher than other metals. The same volume of gold is 1.8 times the weight of the silver and 2.2 times the copper. Therefore, the real gold bearing should feel heavy in hand, and fake gold feels lighter.
(4) Listening to the sound: throw the gold jewelry to the desktop, or throw it on the hard ground. The lower the gold content, the greater the elasticity, the higher the jump, the crisp sound, and there is a tone; the higher the gold content, the higher the content of the gold; The smaller the elasticity, the lower the jump, the sound of the sound is low, heavy, and no sound.
(5) Testing hardness: The higher the gold content of the jewelry, the softer the more soft, and it is easy to bend with your hands, good toughness, and not easy to break. You will leave clear scratches with hard things; the lower the gold content, the harder it will be. It is necessary to use a large strength to bend, and it is easy to break. When the hard things are engraved, the scratches are not obvious.
(6) Scientific test: First, use fire to identify. Put the jewelry in the smoke -free fire, and the color is unchanged after the pure gold is burned; The second is chemistry. With a concentration of 45 % or 70 % sulfuric acid, the gold has no change and keeps the original; the silver becomes black; Because metals such as silver and copper are dissolved in acid, chemical reactions will occur.

How to prevent gold jewelry from changing color
Peremia after wearing gold jewelry, finds color change or fading. Many people think that this is the insufficient color of gold jewelry, so the store negotiates or goes to consumers to go to consumers The association complained, but the defendant's gold jewelry faded was not the insufficient color of gold jewelry, but for other reasons. So what are the reasons?
The discoloration or fading of gold jewelry is closely related to the human sweat. 99%of human sweats are water, and about 1%are waste and harmful substances in the human body, such as chlorine substitutes, lactic acid, urea ammonia, etc. After contacting the silver and copper in gold jewelry, these substances will produce chemical reactions, produce silver chloride and copper sulfide, and show dark black chemical salt. This kind of chemical salt is often dropped from gold jewelry to pollute the skin of the wearer, leaving a very obvious black stain on the skin.
The cosmetics are also one of the indispensable "characters" for people's lives. If you apply it on the skin of the gold jewelry, it will undoubtedly provide opportunities for cosmetics containing chemicals and the golden jewelry that is most afraid of chemical erosion, and the result can be imagined. Some cosmetics also contain some fine hard particles, which can form another type of dirt, thereby wear gold jewelry. Regional environmental factors may also make gold jewelry lose their bright color. For example: dry areas, the air contains more fine dust. After the human body is contaminated, it will form a "human sandpaper". It can wear gold jewelry to erode extremely fine debris and local black stains. It is worth mentioning that the refreshing powder or moisturizing cream also contains similar particles, which will also make gold jewelry barely like the above.
gold jewelry maintenance
gold jewelry is priceless and eternal. For thousands of years, countless people have been attracted by the charm that it never disappears. Although gold jewelry has various colors, improper handling will make it lust. Here are a few points to save gold jewelry.
I. As precious metals, gold jewelry usually does not lose gloss, color loss or pollution due to the pollution of soap, sweat and other items in daily applications. In fact, ordinary daily oil use also reduces the brightness of gold jewelry. So it is best not to apply perfume or cream before wearing gold jewelry, because it may have an impact on it. Also, gold jewelry should be removed before washing your hands to maintain its luster.
is also a good choice for jewelry cleaning cotton cloth today. It not only protects the jewelry from pollution
, but also makes it like new. So there must be enough cloth to wipe off the dirt. Avoid jewelry contact with soapy water and chlorine -containing water.

Golden jewelry purchases
In except for the purchase of large stores that ensure quality, the following four points should be paid for:
1. There must be formal tax invoices, Seed: the name of the jewelry, the color, and the weight. In order to query in the future;
2. Buy according to the age, temperament, body shape and purchase motivation of each person. At present, the jewelry sold in the stores is mostly jewelry in Shenzhen and Guangzhou. It is characterized by novel and beautiful styles, but the purity is not necessarily high; as well as jewelry produced by Zhejiang, the style is relatively traditional, but the gold content is relatively high; r; r; n3 should be carefully checked whether the jewelry is safe, the chain body is straight, buckle, joint, ear clip, etc. In order to make the buckle of the bracelet, the connector of the earrings, and the head of the head, the color of these parts is lower;
4. The jewelry will sometimes turn white. In contact with the phases such as dishwashing or module, chemical reactions occur, so you should also contact the cosmetics during the wearing process. Once you occur, you can request the store to solve it with the invoice. When storing jewelry, it is best to use a soft cloth to pack each piece separately, so as not to rub each other and cause losses.

Golden jewelry identification
The identification of gold requires certain experience. Simply introduce some identification methods. But it is best to go to the gold shop!

(1) See color: the higher the purity of the gold jewelry, the deeper the color. If there is no gold medal, you can determine the general color according to the following color (based on green gold. The so-called green gold contains only silver ingredients in gold); dark red yellow color is more than 95 %, light red yellow 90-95 % The pale yellow is 80-85 %, the cyan is 65-70 %, and the white light is only 50--60 % white light. The slightly yellow and white are less than 50 %. Generally, Qiqing, Eight Huang, and Jiu Chi can be used as a reference. (2) Type weight: The proportion of gold is 19.32, which is more important than metal such as silver, copper, lead, zinc, aluminum. The volume of gold is more than 40 % heavier than the silver, 1.2 times heavier than copper, and 6.1 times heavier than aluminum. The gold jewelry should have a feeling of sinking in the hand, and the fake gold jewelry feels lightly. This method is not suitable for gold jewelry inlaid.

(3) Look at the hardness: pure gold is soft and low. It can draw light marks with nails. Teeth bite can leave tooth prints. High -colored gold jewelry is low and soft, with copper with copper, contains copper containing copper, contains copper containing copper The harder, the harder, the bending method can also test the hardness, the pure gold is soft, it is easy to bend, the lower the purity, the less likely to bend.

(4) Listening to the sound: Real gold with a color of more than 99 % throwing it on the hard ground, it will make a tap sound, there is no rhyme or elasticity. The fake or low golden sound is crispy but no dullness. Generally, the sound of "Dangdang" is emitted, and there are surplus sounds.

(5) Burning with fire: The jewelry will be burned red (do not melt the jewelry) with fire (do not melt the jewelry), and observe the color change after cooling. Dark or different degrees of darkness is not pure gold. Generally, the lower the color, the stronger the color, and the darkens are all, indicating that it is a fake gold jewelry.

(6) Seeing the mark: Domestic gold jewelry is allicized and prepared according to international standards, and the killing records, such as "24K" indicate "foot red" or "foot gold"; The word "18K" is marked, and those who have a lower color are lower than LOK. At present, illegal elements are commonly used to manufacture fake cards and imitation stamps in the society. They use rare gold, Asian gold, and even brass to impersonate real gold. Therefore, the identification of gold jewelry must be comprehensively determined according to the sample to determine the true and false and the quality of the real.

The accurate identification of gold jewelry in accurate commonly used common methods.

(1) Testing gold stone method: Select the black test gold stone with delicate texture, use the standard tasting films with different gold content (on the gold medal) on the test gold stone, and then put the gold jewelry sample you want to identify in The scratches on the same goldstone, drip the concentrated nitric acid to remove the impurities, and find the traces left on the test gold stones compared with the traces of the tested slices. The accurate gold content of gold jewelry samples to be determined.

(2) Chemical method: also known as reagent test method. Gold is insoluble in separate nitric acid, sulfuric acid, and hydrochloric acid, and silver and copper ingredients can be dissolved with nitric acid. Take gold decorative sample. Putting nitric acid on a certain part, if gold will not change color, if it is silver products, it will generate silver oxide and turn black; For gold jewelry with a gold content of more than 95 %, test with nitric acid, the surface changes very small.

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Owen
September 20, 2022 at 7:48 pm

Gold contains more than 99%.
It the old shop in the big shop, or the old shop in the big shop.
The features are:
1: soft (if the strength is large, it is easy to deformed) 2: Yellow 3: See the workmanship (fine edge is smooth)
4: : For example, 999/9999/foot red gold/thousands of gold/foot gold/24K) and brand name
5: Burning with fire (real gold is not afraid of fire, fake will turn black) (Of course, there is not much feeling at about a few grams or 1 gram)
7: Of course, it is handed over to the relevant departments to test ~

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