How to tell the authenticity of gold?

question 1: how to tell the authenticity of gold? Identification of gold ornaments

Identification of gold requires some experience. Here are only some identification methods briefly introduced.

(1) Look at the color: The higher the purity of gold jewelry, the darker the color. In the absence of a gold medal, the general fineness can be determined according to the following colors (based on cyan gold). The so-called green gold is only silver in gold); The fineness of dark reddish yellow is above 95%, light reddish yellow is 9-95%, light yellow is 8-85%, bluish yellow is 65-7%, bluish white is only 5-6%, and yellowish white is less than 5%. The so-called seven greens, eight yellows and nine reds can be used for reference. (2) Weight: The specific gravity of gold is 19.32, which is heavier than silver, copper, lead, zinc, aluminum and other metals. As the volume of gold is more than 4% heavier than silver, 1.2 times heavier than copper and 6.1 times heavier than aluminum. Gold jewelry should feel heavy when held in your hand, while fake gold jewelry feels light and floating. This method does not apply to gold ornaments inlaid with precious stones.

(3) Look at the hardness: pure gold is soft and low in hardness, and shallow marks can be drawn with nails, and teeth marks can be left by biting. Gold jewelry with high color is softer than gold jewelry with low color, and the more copper it contains, the harder it is. The bending method can also test the hardness. Pure gold is soft and easy to bend, and the lower the purity, the harder it is to bend.

(4) Listen to the sound: When real gold with an arc of more than 99% is thrown on hard ground, it will make a beep, with no rhyme or elasticity. Fake or low-quality gold sounds crisp and dull, generally making a "Dangdang" sound, and the sound has a lingering sound, and it beats violently after landing.

(5) Fire: Burn the jewelry to be identified with fire (don't make it melt and deform), and observe the color change after cooling. If the surface is still the original gold color, it is pure gold; If the color darkens or turns black to varying degrees, it is not pure gold. Generally, the lower the fineness, the thicker the color, and all of them turn black, indicating that they are fake gold ornaments.

(6) Look at the marks: domestic gold ornaments are all purified and prepared according to international standards, and marked with a stamp, such as "24K" indicating "full red" or "pure gold"; 18K gold, marked with the word "18K", whose color is lower than loK, can't be stamped with K gold according to the regulations. At present, criminals in society often make fake brands and imitation stamps, and use rare gold, sub-gold and even brass as real gold. Therefore, the identification of gold ornaments should be based on the comprehensive judgment of samples to determine the authenticity and fineness.

question 2: what do you think about gold? . . Why does it smell! That's also a good question and answer. . Because both gold and silver have a characteristic. . . That is, it will absorb toxic things from the human body. Of course it smells a little strange when burned. . Let me ask you if that gold is empty. And whether it's two-sided. There is a small hole at the bottom. Besides, there's not a word. True gold is not afraid of fire. You are smart. Know how to burn. . . If you burn until it turns red, it won't fade. That's true (but it's best not to do it in the future. Because gold will melt if it is overcooked. . . Actually, there's the easiest way. Just go to a jewelry processing shop or a gold shop and show it to the owner. . Generally, you will know when you look at it! ! You don't have to open money! !

question 3: how to simply distinguish the authenticity of gold as simple as possible? Color. Gold is seven green, eight yellow and ten red in nine purple. It means that the gold content of cyan yellow is 7%, that of yellow is 8%, that of purple yellow is 9%, and that of reddish yellow is almost 1%. (2) Look at the specific gravity. Gold has the largest specific gravity among known substances, with a specific gravity of 19.37, the same weight as brass; The volume of red copper is much larger than that of gold and red gold with the same weight. Experienced people can know a thing or two by looking at the color and weighing. (3) Compared with hardness, gold can be identified by burning and acid dissolution. Red gold has the smallest hardness, and can bite marks with teeth and draw lines with pins. Real gold is not afraid of fire, but it is still glittering after being burned in flame, and other metals will oxidize and change color when burned. Real gold is not soluble in a single acid (such as hydrochloric acid and sulfuric acid), and other metals are inferior to gold

Question 4: How to identify the authenticity of a gold bracelet? Gold jewelry refers to jewelry made with gold as the main raw material. With the progress of modern technology, it is more and more difficult to identify its authenticity with the naked eye. My shop specializes in jewelry-Di Mairui, you can also have a look, but I will also tell you several methods to identify the authenticity of gold jewelry here.

Look at the color

According to the different luster and color of gold, pure gold, k gold, real gold and fake gold can be roughly distinguished. That is, reddish yellow is the best gold, and the fineness is above 95%; The fineness of positive yellow is about 8%; The cyan color is about 7%; Yellow is grayish, and the fineness is about 5%. Therefore, there is a formula for "seven green, eight yellow, nine five red, yellow and white with gray half gold." For jewelry that has been hidden for a long time, there is a saying that "copper turns green, silver turns black, and gold never changes color".

Weight

The specific gravity of gold is 19.3, which is higher than other metals. The weight of gold with the same volume is 1.8 times that of silver and 2.2 times that of copper. Therefore, real gold should feel heavy in your hands, while fake gold feels lighter.

when listening to gold jewelry with high rhyme and color, it makes a dull low voice of "poof-poof-poof" when it is knocked or thrown to hard ground, and it has no rhyme and no elasticity. K gold has rhyme, sound and elasticity. The greater the elasticity, the sharper the rhyme, the older the color, and the worse the color.

Hardness test

The higher the gold content of jewelry, the softer it is, the easier it is to bend by hand, and the toughness is good, so it is not easy to break, and it will leave clear scratches when carved with hard objects; The lower the gold content, the harder it is, and it takes a lot of effort < P > Question 5: How to distinguish the authenticity of a gold necklace? The proportion of gold is 17.4, and the Mohs hardness is 2.5; Gold jewelry can be divided into pure gold and k gold. The gold content of pure gold jewelry is above 99%, which can be divided into pure gold and thousand gold. The content of pure gold is not less than 99% and the content of thousand gold is not less than 99.9%. Pure gold: pure gold with a gold content of not less than 99. The stamp is "pure gold", "99 gold", "gold99" or "g99".

Let's take a detailed look at how to distinguish the authenticity of a pure gold necklace:

1. Look at the color

According to the different luster and color of gold, pure gold, k gold, real gold and fake gold can be roughly distinguished. That is to say, reddish yellow (yellow-red) is the best gold, and the fineness is above 95%; The fineness of positive yellow is about 8%; The cyan color is about 7%; Yellow is grayish, and the fineness is about 5%. Therefore, there is a formula for "seven green eight yellow nine five red, yellow and white with gray half gold." For jewelry that has been hidden for a long time, there is a saying that "copper turns green, silver turns black, and gold never changes color".

2. Weighing

Gold is about twice as heavy as silver, lead and tin with the same volume. Real gold feels like falling in your hand, while copper or others only have a heavy feeling without falling.

3. Listening to the sound

When gold jewelry with high color is struck or thrown to hard ground, it makes a dull low voice of "poof-poof-poof-poof", with no rhyme or elasticity. K gold has rhyme, sound and elasticity, and the greater the elasticity, the older the rhyme, the worse the color. Fake or low-quality gold sounds crisp and dull, generally making a "Dangdang" sound, and the sound has a lingering sound, and it beats violently after landing.

4. Folding hardness

Gold with high fineness can leave traces when scratched with pins or nails. More than 97% of the gold jewelry with color is folded two or three times, and wrinkles appear at the bend, also known as fish scales; Gold jewelry with about 95% fineness feels hard when it is bent, and the fish scales are not obvious; About 9% of the gold jewelry is hard when it is bent, and there is no fish scale pattern; Gold jewelry with more impurities will break after two or three bends; If it is made of gold, it will break when it is bent, and the section has obvious sand grains. When using this method, the width and thickness of jewelry should be taken into account. Thick and wide jewelry is harder, while thin and narrow jewelry is softer.

5. Identification of color with touchstone

The color of gold jewelry is determined by grinding the gold pair (the gold medal whose color has been determined) and the tested jewelry on the touchstone. This method should be carried out under natural light and fluorescent lamp, not under direct sunlight and incandescent lamp.

In the past, people often used a touchstone to determine the general content of gold. The touchstone is a mixed black mineral containing carbon, such as Shi Ying and opal. You can see the general fineness of gold by drawing a stripe on the touchstone. Pure gold: shiny deep yellow and thick yellow; Silver-bearing gold: pale to reddish green; Gold containing more than 25% silver: earthy white; Copper-bearing gold: the color is deepened, showing a red tone; Gold containing silver and copper: yellow; Gold containing zinc, copper and nickel: white gold.

6. Use an acid spot

to grind the gold track of the identified jewelry and the right brand on the touchstone respectively, and use a glass rod to test nitric acid on the gold track. Because the chemical property of gold element is stable and does not react with acid, the color remains unchanged. If it is not gold or impure gold, the golden path disappears or changes. The law of change is "three fast and three slow", that is, those with low color disappear quickly and those with high color disappear slowly; Mixed gold disappears quickly, while clear gold disappears slowly; Large mixed gold disappears quickly, while small mixed gold disappears slowly. Depending on the disappearance of the golden path, the color of gold jewelry can be determined by comparing the cards.

7. Burn with fire

Burn the jewelry to be identified with fire (don't make it melt and deform), and observe the color change after cooling. If the surface is still original gold color, it is pure gold; If the color darkens or turns black to varying degrees, it is not pure gold. Generally, the lower the fineness, the thicker the color, and all of them turn black, indicating that they are fake gold ornaments. When it really burns red, it is quenched into water, and its color remains unchanged. It really doesn't change color when it meets fire, and it doesn't resist fire, and it becomes dark purple and not bright.

To do an experiment, two pieces of gold with different purity, one containing a small amount of impurities and the other 1, gold, were melted by professional welding guns respectively, and the melted gold showed completely different states. The gold necklace with low purity is dark in color and rough in section, and the place with flux is obviously black; However, Wanjinjin is still as bright as new gold, and the melting surface is smooth and clean, even brighter than before.

question 6: how to distinguish the authenticity of 9999 gold? Only the authenticity of gold can be distinguished. The easiest way is to set it on fire, and the color will be true when it cools down. No one can recognize 9999 or 999 or 99, which is invisible to the eyes. Can only be measured by instruments. Or check on the website, because it is very simple, every 9999 gold has a number, and log on to the website of the National Gold and Silver Products Quality Supervision and Inspection Center to enter the number for inquiry, which can immediately confirm the identity of Wanchun Gold.

question 7: how to identify the authenticity of gold jewelry? 1. Recognize the manufacturer and color. The manufacturer and alloy purity (fineness) should be printed on the surface of gold jewelry, and the words should be clear. For example, the words "Jing e Jin Jin" are printed on the gold jewelry with pure gold produced by Beijing Jewelry Factory. If there is no mark on the jewelry, or the mark is vague, you should doubt the authenticity of the gold jewelry. 2. Check the color and hardness. Gold should be bright reddish yellow, the higher the fineness, the more beautiful the color, so people often say "seven green, eight yellow, nine five red". The so-called gold jewelry, which is passed off as other metals, can be identified by its color. Gold has a low hardness and is relatively soft. If you scratch it with a knife or bite it with your teeth, there will be traces. Other metals do not have this feature? Moreover, the higher the fineness of gold jewelry, the softer it becomes, and the fineness can be checked by bending. If the color is low, which contains more silver and copper components, it is not easy to bend. This method can be used to identify whether the first ornament is shoddy or not. 3. Compare weights. The specific gravity of gold is 19.3, which is higher than that of silver, copper, aluminum, tin and other metals. The same volume of gold is 4% heavier than silver, 1.2 times heavier than copper and 6.1 times heavier than aluminum. By comparing the weights, we can also identify whether other metals are used as fake gold ornaments. 4. Listen to the sound and distinguish the components. If jewelry falls naturally from a height, it will be gold with a purity of 99‰ if it only makes a "beep" sound and has no rhyme or elasticity. If the sound is long and elastic, it means that its color is not high, and the jewelry contains more copper and other metal components. 5. Nitric acid distinguishes the authenticity of gold. Put jewelry in nitric acid, if it is gold, it will be safe and sound, and there will be no change; If it is copper, it will emit green smoke. 6. Taste the truth. Put the jewelry in your mouth and lick it with your tongue for a while, then smoke. If there is no smell, it is gold; If it smells of sweet silk, it means it is copper. 7. Fire knows the truth. "Real gold is not afraid of being refined by fire". After the jewelry is cooled by high temperature fire, if it is still yellow and does not deform, it is gold; If it turns black, it is not real gold, but a counterfeit product made of other metals.

question 8: how to tell the authenticity of gold jewelry? With the improvement of people's living standards, the jewelry market is becoming more and more popular. To buy gold jewelry in the mall, you need to have independent identification ability, and knowing how to identify the authenticity of gold jewelry is also a science, which is beneficial to your later life. Knowing how to identify gold jewelry, you don't have to worry about whether the jewelry you buy is real or not, and you spend money and buy fakes, which is the last thing people want to see.

Now I will provide you with the information I have seen for your reference: some of the popular gold jewelry or commemorative coins in the market are imitation gold products or fake and inferior products. Therefore, special attention should be paid to identification when purchasing. The commonly used identification methods are as follows:

1. Check the stamp: At present, all the gold jewelry produced by Chinese manufacturers have the words "our factory stamp" and "gold content".

At present, the gold jewelry produced by Chinese manufacturers is purified and prepared according to international standards, and marked with K to indicate the amount of gold in metal products. The pure gold is 24K, with a gold content of 99.6%. 22K gold content is 91.3%; The gold content of 2K is 83.3%; The gold content of 18K is 74.7%. The gold content of 14K is 58.5%; The gold content of 9K is 37.5%. The gold content of 8K is 33.3%; The gold content of 1K is 4.166%. According to the words 24K or 18K on the mark, you can know the color of the jewelry, but if it is less than 1K, you can't print K-gold.

among jewelry marks, pure gold =99, thousands of pure gold =999, and thousands of pure gold =9999. Generally speaking, gold jewelry is marked with three kinds of marks: pure gold, thousands of pure gold and 9999, and platinum is mainly marked with marks such as PT95\PT99. According to the above marks, you can buy it in a regular store. It is important to have an invoice and a national inspection certificate. If something goes wrong, you can trace it back.

2. Balance weight: The density of gold is higher than that of silver, copper, lead, aluminum and other metals. Gold with the same volume is 4% heavier than silver, 1.2 times heavier than copper and 6.1 times heavier than aluminum. When the gold is held in your hand, you will feel heavy.

3. Look at the color: generally, the higher the purity of gold jewelry, the darker the color. The pure gold is yellow and purple, the 18K is yellow and blue, and the 14K gold is yellow and red.

4. listen to the rhyme: throw the gold jewelry on the hard ground and listen to its sound when landing. The sound made by real gold is low, thick and heavy, and there is no aftersound. The sound of fake gold is crisp without dull feeling, and it is generally a "Dangdang" sound with a lingering sound. Real gold doesn't jump as hard as fake gold when it hits the ground.