Identifying gold requires some experience. Here are just some identification methods.
(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 just silver in gold); The fineness of deep red yellow is above 95%, light red yellow is 90-95%, light yellow is 80-85%, blue yellow is 65-70%, blue white is only 50-60%, and yellow white is less than 50%. The so-called seven greens, eight yellows and nine reds can be used for reference. (2) Balance weight: The specific gravity of gold is 19.32, which is heavier than silver, copper, lead, zinc, aluminum and other metals. Because the volume of gold is more than 40% heavier than that of silver, 1.2 times heavier than that of copper and 6. 1 times heavier than that of aluminum. Gold jewelry should feel heavy in your hand, while fake gold jewelry feels light and floating. This method is not suitable for gold ornaments with precious stones.
(3) Look at hardness: Pure gold is soft and low in hardness, and shallow marks can be drawn with nails, and tooth marks can be left after biting. Gold ornaments with high color are softer than those with low color, and the more copper they contain, the harder they are. Bending method can also be used to test hardness. Pure gold is soft and easy to bend, and the lower the purity, the more difficult it is to bend.
(4) Listen to the sound: If you throw real gold with a radian of more than 99% on the hard ground, it will beep, without rhyme and elasticity. Fake or low-quality gold sounds crisp and dull, generally making a "Dangdang" sound, with a lingering sound, and violently beating after landing.
(5) Burning with fire: Burn the jewelry to be identified with fire (do not melt and deform the jewelry), and observe the color change after cooling. If the surface is still golden, 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 mark: domestic gold ornaments are purified and prepared according to international standards, and marked with marks, such as "24K" for "full red" or "pure gold"; 18K gold, marked with the words "18K". If the color is lower than Locke, the K-gold seal number cannot be printed according to regulations. Nowadays, criminals in the society often make fake brands and imitate stamps, and use rare gold, inferior 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 color.
Question 2: What do you think of gold? . . Why does it smell! This is also a good question and answer. . Because gold and silver have one characteristic. . . Is to absorb toxic things from the human body. Of course, it smells a little strange when it's burned. . Let me ask you if the gold is empty. And whether it is double-sided. There is a small hole at the bottom. Besides, not a word. True blue will never stain. You are very clever. Know how to burn. . . If you burn it 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 can tell at a glance! ! No need to open the money! !
Question 3: How to distinguish the authenticity of gold as simply as possible? Color. Gold is seven greens, eight yellows and ten reds, nine purple. It means that the gold content of cyan yellow is 70%, yellow is 80%, purple yellow is 90%, and red yellow is almost 100%. (2) Look at the specific gravity. Gold has the largest specific gravity among known substances, with the specific gravity of 19.37, which is as heavy as brass. The volume of 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 it. (3) Compared with hardness, gold can be identified by burning and acid dissolution. Red gold has the smallest hardness, so you can use teeth to bite marks and draw lines with pins. Real gold is not afraid of fire, but it still shines after burning in flame, and other metals will also oxidize and change color when burning. Real gold is insoluble in a single acid (such as hydrochloric acid and sulfuric acid), and other metals are not as good as gold.
Question 4: How to identify the authenticity of a gold bracelet? Gold jewelry refers to jewelry made of gold as the main raw material. With the progress of modern technology, it is more and more difficult to distinguish authenticity with naked eyes. My shop specializes in jewelry-Dimaire, you can also have a look, but I will also tell you several ways to identify the authenticity of gold jewelry here.
Look at this 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, red and yellow are the best gold, and the purity is above 95%; The fineness of positive yellow is about 80%; Cyan accounts for about 70%; Yellow is light gray, and the fineness is about 50%. Therefore, there is a formula of "seven green, eight yellow, nine five red, yellow and white with gray and 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".
consider
The specific gravity of gold is 19.3, which is higher than other metals. The weight of the same volume of gold is 0.8 times that of 65438+ silver and 2.2 times that of copper. Therefore, real gold should feel heavy in your hand, while fake gold feels lighter.
When listening to high-rhyme gold jewelry, it makes a dull and low sound of "poof-poof-poof" when it is knocked or thrown to the hard ground, without rhythm and elasticity. K gold has rhyme, sound and elasticity. The greater the elasticity, the sharper the rhyme and the worse the color.
hardness testing
The higher the gold content of jewelry, the softer it is. It is easy to bend by hand, with good toughness and not easy to break. Carving with hard objects will leave clear scratches. The lower the gold content, the harder it is, and it takes a lot of effort.
Question 5: How to identify 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 is divided into pure gold and thousands of pure gold. The content of pure gold is not less than 99%, and the content of pure gold is not less than 99.9%. Pure gold: pure gold with a gold content of not less than 990. The stamps are pure gold, 990 gold, 990 gold or g990 gold.
Let's take a closer look at how to distinguish the authenticity of a 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. In other words, red and yellow (yellow-red) is the best gold with a fineness of over 95%; The fineness of positive yellow is about 80%; Cyan accounts for about 70%; Yellow is light gray, and the fineness is about 50%. Therefore, there is a formula of "seven green, eight yellow, nine five red, yellow and white with gray and 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".
Step 2 consider
With the same volume of silver, lead and tin, the weight of gold is about twice. Real gold feels like falling in your hand, while copper or others only feel heavy and don't fall.
3. Listen to the sound
When high-quality gold jewelry is knocked or thrown to the hard ground, it will make a dull and low sound of "poof-poof-poof", which has no rhythm and elasticity. K gold has rhyme, sound and elasticity. The greater the elasticity, the sharper the rhyme, and the older the person, the worse the color. Fake or low-quality gold sounds crisp and dull, generally making a "Dangdang" sound, with a lingering sound, and violently beating after landing.
4. Bending hardness
When high-quality gold is carved with pins or nails, it will leave traces. More than 97% of colored gold jewelry is folded two or three times, and wrinkles appear at the bend, also known as fish scales; Gold ornaments with a fineness of about 95% feel hard when bending, and the scales are not obvious; About 90% of gold ornaments are hard when bending, and there are no fish scales; Gold jewelry with many impurities will break after two or three bends; If it is made of gold, it will break when bent, and there are obvious sand grains on the cross section. When using this method, the width and thickness of jewelry should be considered. Thick and wide jewelry is harder, while thin and narrow jewelry is softer.
5. Identify colors with touchstones.
The color of gold jewelry is determined by grinding the gold card (the gold medal whose color has been determined) and the measured jewelry on the touchstone and comparing the colors. The method should be carried out under natural light and fluorescent lamps, not under direct sunlight and incandescent lamps.
In the past, people often used a touchstone to determine the approximate content of gold. Touchstone is a mixed black carbonaceous mineral such as timely and opal. If you draw a stripe on the touchstone, you can see the approximate fineness of gold. Pure gold: shiny deep yellow and thick yellow; Silver-bearing gold: light to red and 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: platinum.
Step 6 use acid spots
On the touchstone, grind the gold channel of the identified jewelry and the correct brand respectively, and test nitric acid on the gold channel with a glass rod. Because the chemical property of gold element is stable and does not react with acid, its color remains unchanged. If it is not gold or impure gold, the path of gold disappears or changes. The law of change is "three fast and three slow", that is, the low color disappears quickly and the high color disappears slowly; Mixed gold disappears quickly, while clear gold disappears slowly; Large mixed gold disappears quickly, while small mixed gold disappears slowly. According to the disappearance of the golden path, the color of gold ornaments can be determined by comparing cards.
Step 7 burn with fire
Burn the jewelry to be identified (don't make it melt and deform), and observe the color change after cooling. If the surface is still golden, 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 in case of fire, it doesn't resist fire, and it becomes dark purple.
In an experiment, two kinds of gold with different purities were melted by a professional welding torch, one containing a small amount of impurities and the other all gold, and the melted gold showed a completely different state. The gold necklace with low purity is dark in color and rough in section, and the place with flux is obviously black; But tiger balm is still as bright as new, and the melted surface is smooth and clean, even brighter than before.
Question 6: How to tell the authenticity of 9999 gold? Only the authenticity of gold can be identified. The easiest way is to burn it on the 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 naked eye. It can only be measured by instruments. Or look it up on the website, because it's very simple, every 9999 gold has a number. Log in to the website of the National Gold and Silver Products Quality Supervision and Inspection Center and enter the number for inquiry, and you can immediately confirm the identity of Wanchun Gold.
Question 7: How to identify the authenticity of gold ornaments? 1. Identify the manufacturer and color. The surface of gold jewelry should be printed with the manufacturer and alloy purity (fineness), and the words should be clear. For example, the words "Jin Jinge Gold" are printed on the pure gold jewelry produced by Beijing Jewelry Factory. If there is no mark on the jewelry, or the mark is vague, it is necessary to doubt the authenticity of the gold jewelry. 2. Check the color and hardness. Gold should be bright red and 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, pretending to be other metals, can be identified by color. Gold is very hard and soft. If you cut with a knife or bite with your teeth, there will be traces. Other metals do not have this characteristic. And the higher the fineness of gold jewelry, the softer it will be. You can check its fineness by bending it. If the color is low and contains more silver and copper, 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 40% heavier than silver, 1.2 times heavier than copper and 6. 1 times heavier than aluminum. By weight comparison, we can also identify whether there are other metals as fake gold ornaments. 4. Listen to the sound and identify the components. If jewelry falls naturally from a height, it only makes a "beep" sound without rhythm and elasticity, that is gold with a purity of 990‰. If the sound is long and elastic, it means that its color is not high, and the jewelry contains more metal components such as copper. Nitric acid can distinguish 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. Real taste. Put 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 like sweet silk, it means copper. 7. Fire knows the truth. "real gold is not afraid of fire." If the jewelry is still yellow and does not deform after being cooled by high temperature fire, it is gold; If it turns black, it is not real gold, but a counterfeit made of other metals.
Question 8: How to tell the authenticity of gold ornaments? With the improvement of people's living standards, the jewelry market is becoming more and more popular. Buying gold jewelry in shopping malls requires independent identification ability. Knowing how to identify the authenticity of gold jewelry is also a science, which will be of great benefit to your future life. Knowing how to identify gold jewelry, you don't have to worry about whether the jewelry you buy is real or not, and spend money on 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 gold ornaments or commemorative coins are popular in the market, some are imitation gold products, and some are fake and shoddy products. So pay special attention to identification when buying. Commonly used identification methods are as follows:
1. Seal check: At present, all gold ornaments produced by China manufacturers have the words "our factory seal" and "gold content".
At present, the gold ornaments produced by China manufacturers are all purified and prepared according to international standards, and marked with K to indicate the gold content of metal products. Pure gold is 24K, with a gold content of 99.6%. The gold content of 22K is 91.3%; 20K contains 83.3% gold; 18K contains 74.7% gold; 14K contains 58.5% gold; 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 lower than 10K according to the regulations, you can't print K gold.
Among the jewelry signs, pure gold =99, thousand gold =999, and thousand gold =9999. Generally speaking, gold ornaments are marked with pure gold, pure gold and 9999, while platinum is mainly marked with PT950\PT990. According to the sign above, you can buy it in a regular store. It is important to have invoices and national inspection certificates. If something goes wrong, you can trace it back.
2. Weighing: The density of gold is greater than that of silver, copper, lead, aluminum and other metals. The same volume of gold is 40% heavier than silver, 1.2 times heavier than copper and 6. 1 times heavier than aluminum. When gold is in your hand, you will feel heavy.
3. Look at the color: Generally, the higher the purity of gold jewelry, the darker the color. Pure gold is yellow and purple, 18K is yellow and blue, 14K is yellow and red.
4. Listen to the rhyme: throw the gold jewelry on the hard ground and listen to the sound when it lands. The sound of real gold is deep and heavy, and there is no lingering sound. The sound of fake gold is crisp and not dull, generally it is a "Dangdang" sound, and the sound is lingering. Real gold didn't jump so hard when it landed.
5. Hardness test: Pure gold has a small hardness and can be bent by hand. Fake gold feels hard when it is bent by hand. If you scratch jewelry with a pin, the scratches of pure gold products will be clearer. Jewelry with low gold content is vague even if it can draw traces. Gold-plated jewelry is more blurred.
6. Please ask experienced and familiar people or professionals to identify, but it is best to identify gold jewelry yourself before.
The above methods are simple test methods. In order to accurately identify, the following three methods can be used.
A fire method is to barbecue jewelry in the fire and take it out when the jewelry is reddish. After cooling, the color of pure gold jewelry is still as new, and the surface of K gold jewelry presents a smoky gray oxide layer. The lower the purity, the darker the color.
B touchstone method Select a black touchstone with delicate texture, and mark the touchstone with gold pieces with different gold contents as a comparison standard. Then, the jewelry to be tested is scratched on the same touchstone, and concentrated nitric acid is dripped to remove impurities. The trace left on the touchstone is the gold content of the jewelry. According to the standard, find out the same chromaticity as the trace, that is, the accurate gold content of the measured jewelry.
C chemical method drops 70% nitric acid on the jewelry respectively, and the real gold jewelry remains unchanged. It's not real gold jewelry that reacts chemically.
Gold jewelry refers to jewelry made of gold as the main raw material. The chemical symbol of gold is Au and its specific gravity is 17.4.
E Mohs hardness is 2.5. Gold jewelry can be divided into pure gold and gold content. The gold content of pure gold jewelry is above 99%, and the highest can reach 99. 99%. Therefore, it is also called "99 gold"/"pure gold" and "red gold".
Is the gold jewelry made of gold and other metals? Jewelry made of (such as silver and copper) is also called "opening gold" and "molding gold". Due to the number of other gold ornaments added, different kinds of gold ornaments have been formed.
Among gold jewelry, pure gold jewelry is soft in texture, with teeth marks and easy to bend, and the color is >>.
Question 9: How to tell the authenticity of gold with naked eyes? (1) Determine the manufacturer and color:
The surface of gold jewelry should be printed with the manufacturer and alloy purity (fineness), and the words should be clear. If there is no mark on the jewelry, or the mark is vague, it is necessary to doubt the authenticity of the gold jewelry.
(2) check the color and change:
Gold should be bright red and yellow, and its luster and color are lasting. The higher the fineness, the more beautiful the color, so people often say "seven green, eight yellow, nine five red". Other so-called gold ornaments lied by polymetallic can be identified by color.
Auricular point method
Listen to the voice and say the composition. If jewelry is naturally attached from a height, if it only makes a "beep" sound, and it has no rhyme and elasticity, it is gold with a purity of 990‰. If the sound is long and elastic, it means that its color is not high, and the jewelry contains more metal components such as copper.
Manual dynamic balance method
That is, compare the weights manually. 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 40% heavier than silver, 1.2 times heavier than copper and 6. 1 times heavier than aluminum. By weight comparison, we can also identify whether there are other metals as fake gold ornaments. The easiest way is to weigh yourself by hand, and then you can know the truth. As the saying goes, gold is very heavy, because the same volume of gold is much heavier than other metals such as copper and aluminum.
Bite method
Teeth biting Jian Zhen king. Gold has low hardness and is relatively soft. Bite lightly with your teeth, and there will be traces. Other metals do not have this characteristic. Moreover, the higher the fineness of gold jewelry, the softer it is, and the fineness can be checked by bending. If the color is low and contains more silver and copper, it is not easy to bend. This method can be used to identify whether gold ornaments are shoddy or not.
Lick your tongue
Real taste. Put the gold ornaments in your mouth and lick them with your tongue for a while, then smoke. If there is no smell, it is gold. If it smells like sweet silk, it means copper. If it is a good place to buy a diamond ring, the price is actually very high, because brand businesses such as Chow Tai Fook and Zhou Shengsheng will definitely add the added value of the brand, which is higher, but the price will not be very low. At the same time, the main evaluation of diamonds is to transport the value of diamonds according to the four standards of color, clarity, weight and cutting, so I suggest you go to the regular website to buy them. What if you decide to buy a diamond ring online? Colleagues customized a diamond ring for the girlfriend's real name registration system in Jintaifu's online mall. If customized, you can consider Jintaifu Diamond Wedding Diamond Customization Center. It is said that Jintaifu Diamond Jewelry Customization Center focuses on customizing emotional diamond jewelry. Incorporate the love bits and pieces into the design. Deeply favored by urban white-collar workers, all the female colleagues in our office think that his girlfriend is very happy, and we are all envious. We all think this male colleague is very considerate. I think this diamond ring is also suitable for you and your girlfriend.