Oiliness test: use a special pen or ballpoint pen dipped in oily ink to draw a line on the diamond table, which will leave an uninterrupted straight line. However, other imitations are not lipophilic, leaving intermittent dotted lines at the scribe line.
Water drop test: the water drops on the diamond will remain spherical for a long time, while the water drops on the imitation will disperse in a short time.
Breathing test: breathe into the diamond, if the water vapor on the diamond disappears, it will become a real diamond immediately; If the water vapor stays on the diamond for a few seconds and then disappears, it is a fake diamond.
Sensory test: At room temperature, diamonds and their imitations are much cooler when you touch them with your tongue.
A simple way to identify diamonds
With the increasing demand for jewelry and diamonds, the market for fake diamonds such as artificial diamonds is expanding, and even some jewelry operators can't tell the difference. Here are some simple ways to identify the authenticity of diamonds.
1, single refraction of diamond
The single refraction of diamond is determined by its essential characteristics. While other natural gemstones or artificial gem are mostly birefringent. When the fake diamond is observed with a magnifying glass of 10 times, it is easy to see that the edges and corners overlap, and two bottom lights are exposed at the same time from the slightly inclined front. If the difference in birefringence is small, such as zircon, you can also see the image of overlapping background light.
2. Adsorption of diamonds
Diamonds have a certain affinity for grease and dirt, that is, oil stains are easily adsorbed by diamonds. So touching the diamond with your fingers will feel sticky, and your fingers seem to feel sticky. This is not found in any gem. This method needs training to master the nuances.
3. Characteristics of straight lines
The surface of the diamond is polished very smoothly. Dip the pen in ink and cross the diamond. If it is a real diamond, the surface will leave a smooth and continuous line, which is characterized by a straight line. Forgery will leave dots and lines. Observation in this way should be made with the help of a magnifying glass.
4. Unique diamond luster
Under the incandescent light of 100 degree, it is easy to see which diamond has diamond luster by comparing with the counterfeit. This method should not be carried out in too dark or too strong light.
Question 2: How to judge a diamond ring by itself? Netizen replied (***2) The chemical composition of Ivy Iris pencils is the same as that of diamonds, but the physical structure is different, so many people use pencils to detect the authenticity of diamonds, which is a more practical and effective method. When identifying, first wet the diamond with water, and then gently carve it with a pencil. On the crystal face of a real diamond, where the pencils cross, there is no trace, but if it is not a diamond, it is glass and crystal. It will leave a mark on the surface. Generally speaking, pencils are used to identify the authenticity of diamonds. This method has high accuracy. The answer time is 2013-01-1517: 20. Natural small diamonds have strong heat transfer ability, and hot air dissipates quickly. The diamond to be tested is close to the mouth so that it can breathe gently.
Question 3: How to distinguish the authenticity of diamonds, and how to distinguish real diamonds from "Soviet diamonds"
Real diamonds are expensive, and fake diamonds are often passed off as real diamonds. Cubic zirconia is a synthetic compound used in the mid-1970s. Its refractive index, dispersion and other optical properties are similar to real diamonds, and they are all isotropic. When polished into a diamond shape, cubic zirconia is no different from real diamonds in appearance. If you don't use special methods to identify, even some gem practitioners are difficult to identify. Because the former Soviet Union first introduced cubic zirconia diamonds, it is often named after "Soviet diamonds" in business. In fact, the former Soviet Union also produced real diamonds, and its output occupies an important position in the world. The following table is a comparison of the main characteristics of real diamonds and cubic zirconia. ?
As can be seen from the above data, the difference between real diamonds and "Soviet diamonds" can be distinguished by testing hardness and specific gravity. However, it is inconvenient to measure the specific gravity with toxic heavy liquid, because the hardness is easily destroyed. In addition, gem particles are small, so it is not easy to distinguish authenticity by hand feeling. At present, there is an advanced, rapid and accurate method to identify the authenticity of diamonds by thermal conductivity. The specific thermal conductivity of real diamonds is between 16000- 18000, while that of "Soviet diamonds" is only between 50- 100. So in the early 1980s, a kind of "thermal conductivity meter" was designed. After many improvements, a portable pocket thermal conductivity meter has been produced. After the probe of the thermal conductivity meter is heated, the thermal needle contacts the diamond to be measured. If it is a real diamond, the heat on the thermal needle will soon be transmitted from the real diamond, and the LED of the thermal conductivity meter will display it and chirp at the same time. If the hot needle touches the "Soviet diamond" or other gemstones with poor thermal conductivity, the LED will not flash upward and will not chirp, but it will also chirp; If the hot needle comes into contact with "Soviet diamonds" or other gems with poor thermal conductivity, the LED will not flash upwards and will not chirp, so it is the most convenient means to identify the authenticity of diamonds with a thermal conductivity meter.
giyn/article/printpage.asp？ id=5 1
Prove that there must be.
Now it's the overlord clause, so we can only sell it and not refund it.
Question 4: How to tell the authenticity of a ring? Where are the diamonds? Thanks to visual recognition.
Perspective test-clean the gem with a round diamond cutter, put it on a piece of white paper with lines drawn on it, and judge whether the gem is a diamond by observing the lines on the paper. If it is a standard round cut diamond, the lines on the paper cannot be seen through the diamond (synthetic strontium titanate and synthetic rutile are similar to diamonds and have no perspective effect). However, due to the different refractive index, most imitations have enough light leaking from the pavilion surface, and some lines on the paper can be seen through perspective observation.
Brightness estimation-The ability of the jewel crown to reflect and refract light externally and totally internally is called brightness. When diamonds and their imitations are placed in the same light source and environment, the standard round diamonds with fine cuts are observed from the bottom, and almost all the light entering from the crown is reflected by the crown, showing strong brightness. However, the refractive index and cut of imitation are different from that of diamond, and the light entering from the crown will leak out from the pavilion to varying degrees, thus reducing the brightness.
Oiliness test-Draw a line on the diamond table with a special pen or ballpoint pen dipped in oily ink, which will leave an uninterrupted straight line. However, other imitations are not lipophilic, leaving intermittent dotted lines at the scribe line.
In the water drop test, clean the mesa of diamond and imitation, drop a little water each, and observe the time and contour of the water drop. The water droplets on the diamond will remain spherical for a long time, while the water droplets on the imitation will disperse in a relatively short time.
Breath test-put the sample to be tested and the known diamond sample together on the glass, blow on them and observe the disappearance of the fog. The fog on the diamond disappears quickly, but the fog on the imitation disappears slowly.
Sensory test-at room temperature, when the tip of the tongue touches the diamond and its imitation, the diamond is much cooler than the imitation.
I wonder if I can help the landlord. The best way is to go to the appraisal center for appraisal, which is only a few tens of dollars. You don't need a certificate for identification, and it is even more expensive to ask for a certificate.
Question 5: How can we detect the authenticity of a diamond ring? Breath test: You can breathe into the diamond. If the water vapor on the diamond disappears immediately, it is a real diamond, and if the water vapor stays on the diamond for a few seconds, it is an imitation.
Water drop test: drop a drop of water on the diamond. If the water drops remain spherical for a long time, it means that the diamond is real; if the water drops disperse in a relatively short time, it means that it is an imitation.
Test with an oily pen: A special pen or ballpoint pen with oily ink can also tell you how to distinguish diamonds from real diamonds. Draw a line on the diamond table. If you leave an uninterrupted straight line, the diamond is real. However, if there are intermittent dotted lines at the scribing point, it means imitation. But this method needs to be observed with a magnifying glass.
White paper marking test: draw a black line on white paper and put the edge of the diamond table on that line. If you can't see that line, it means that the diamond is real. If you can see it, it's fake.
Look at the adsorption test: diamonds have a strong adsorption to oil and dirt, and they will feel sticky when touched with your fingers. This is not found in other gems. In this way, it is necessary to strengthen the training of finger touch.
Diamond luster test: under the incandescent light of 100 degree, it is easy to compare the cut diamond with the fake one, and it is easy to compare which one has diamond luster. But this method should not be carried out in too dark or too bright light.
Question 6: How to identify the authenticity of diamond 1 and the single refraction of diamond?
The single refraction of diamond is determined by its essential characteristics. While other natural gemstones or artificial gem are mostly birefringent. When the fake diamond is observed with a magnifying glass of 10 times, it is easy to see that the edges and corners overlap, and two bottom lights are exposed at the same time from the slightly inclined front. If the difference in birefringence is small, such as zircon, you can also see the image of overlapping background light.
2. Adsorption of diamonds
Diamonds have a certain affinity for grease and dirt, that is, oil stains are easily adsorbed by diamonds. So touching the diamond with your fingers will feel sticky, and your fingers seem to feel sticky. This is not found in any gem. This method needs training to master the nuances.
3. Characteristics of straight lines
The surface of the diamond is polished very smoothly. Dip the pen in ink and cross the diamond. If it is a real diamond, the surface will leave a smooth and continuous line, which is characterized by a straight line. Forgery will leave dots and lines. Observation in this way should be made with the help of a magnifying glass.
4. Unique diamond luster
Under the incandescent light of 100 degree, it is easy to see which diamond has diamond luster by comparing with the counterfeit. This method should not be carried out in too dark or too strong light.
High hardness synthetic diamond
The R&D Center of General Electric Company of the United States has synthesized synthetic diamonds with atomic density per unit volume higher than that of any existing solid substance, and the hardness is higher than that of natural diamonds, which is the hardest material in the world. It contains 99% carbon 13 isotope and natural diamonds. According to scientists' observation, with the increase of carbon isotope density 13, the distance between atoms will be slightly reduced, which makes the hardness of artificial diamonds exceed that of natural diamonds with slightly loose atomic arrangement. In the process of synthesizing synthetic diamonds, scientists first precipitate carbon in methane gas rich in carbon isotope 13 into small diamond fragments by chemical evaporation, then decompose these small fragments with very high pressure, and then recrystallize the massive diamond with the maximum weight of 3 carats.
===
Diamond is one of the hardest gems found on the earth, which symbolizes eternal love and is cherished by people. Many people want to have a beautiful diamond for their loved ones, but how to buy a diamond that they like and are worth the money is a science.
What is a diamond? Diamond is the only gem in the world that is made of a single carbon element. It is the hardest natural substance at low temperature and high pressure.
What is the 4C of a diamond?
The clarity and flawless degree of a diamond.
Colored diamonds come in different colors. Generally speaking, the whiter the better.
Cutting involves the shape and proportion of diamonds, as well as the factors that affect the aesthetic feeling of sparkling fire colors.
Actual weight of carat diamond (1ct = 0.2g = 100 min)
The actual weight of how much diamonds you have to pay depends on these four C's, and these four C's are the biggest factors that determine the price of the fifth C.
How to identify diamonds?
1, if you draw a line with a pen and ink on the table of a diamond, it will be an uninterrupted straight line, while other gems are intermittent dotted lines, because diamonds are lipophilic.
2. If the diamond is yellow when viewed from the side, then the Yan * * * level is generally below the "I" color, because when viewed from the front of the diamond, only the shiny fire color can be seen, unless the diamond is yellow, the color cannot be seen clearly.
3. When we distinguish diamonds from other imitation gems, we can use a breath of "ha" to form steam on the surface of diamonds. Diamonds conduct heat quickly, and the steam will disappear in one second, while other gems take a long time. Generally, diamond pens for jewelry are made according to the principle of heat conduction.
Finally, when you decide on diamonds, it is very important to ask the merchant for the certificate of a formal testing institution, which will give you better protection. ...& gt& gt
Question 7: How can a diamond ring distinguish between true and false? Hello, diamond ring identification method 1 water drop test method: drop a drop of water on the diamond ring. If the water drops remain spherical for a long time, it means that the diamond ring is real, and if the water drops disperse in a relatively short time, it is an imitation. 2 white paper marking test method: draw a black line on white paper and put the surface side of the diamond on the diamond ring on that line. If you can't see that line, it means that the diamond ring is real. If you can see it, it is fake. Draw a line on the diamond table of the diamond ring with a special pen or ballpoint pen dipped in oily ink. If you leave an uninterrupted straight line, it means that the diamond ring is real. However, if there are intermittent dotted lines at the scribing point, it means imitation. But this method needs to be observed with a magnifying glass. Breathing test method: Breathe into the diamond ring. If the water vapor on the diamond ring disappears immediately, it is a real diamond ring. If the water vapor stays on the diamond ring for a few seconds before disappearing, it is an imitation. Touch test method: diamond has strong oil adsorption, and it will feel sticky when touching it with your fingers. This is not found in other gems. In this way, it is necessary to strengthen the training of finger touch. Single refraction test method: 5 Single refraction test method: The essential characteristics of diamond determine the single refraction of diamond ring. While other natural gemstones or artificial gem are mostly birefringent. When the fake diamond is observed with a magnifying glass of 10 times, it is easy to see that the edges and corners overlap, and two bottom lights are exposed at the same time from the slightly inclined front. A well-cut diamond is compared with a fake under the incandescent light of 100 degree, and it is easy to compare which one has diamond luster. But this method should not be carried out in too dark or too bright light.
Question 8: How can diamonds be identified from authenticity?
Oiliness test: use a special pen or ballpoint pen dipped in oily ink to draw a line on the diamond table, which will leave an uninterrupted straight line. However, other imitations are not lipophilic, leaving intermittent dotted lines at the scribe line.
Water drop test: the water drops on the diamond will remain spherical for a long time, while the water drops on the imitation will disperse in a short time.
Breathing test: breathe into the diamond, if the water vapor on the diamond disappears, it will become a real diamond immediately; If the water vapor stays on the diamond for a few seconds and then disappears, it is a fake diamond.
Sensory test: At room temperature, diamonds and their imitations are much cooler when you touch them with your tongue.
A simple way to identify diamonds
With the increasing demand for jewelry and diamonds, the market for fake diamonds such as artificial diamonds is expanding, and even some jewelry operators can't tell the difference. Here are some simple ways to identify the authenticity of diamonds.
1, single refraction of diamond
The single refraction of diamond is determined by its essential characteristics. While other natural gemstones or artificial gem are mostly birefringent. When the fake diamond is observed with a magnifying glass of 10 times, it is easy to see that the edges and corners overlap, and two bottom lights are exposed at the same time from the slightly inclined front. If the difference in birefringence is small, such as zircon, you can also see the image of overlapping background light.
2. Adsorption of diamonds
Diamonds have a certain affinity for grease and dirt, that is, oil stains are easily adsorbed by diamonds. So touching the diamond with your fingers will feel sticky, and your fingers seem to feel sticky. This is not found in any gem. This method needs training to master the nuances.
3. Characteristics of straight lines
The surface of the diamond is polished very smoothly. Dip the pen in ink and cross the diamond. If it is a real diamond, the surface will leave a smooth and continuous line, which is characterized by a straight line. Forgery will leave dots and lines. Observation in this way should be made with the help of a magnifying glass.
4. Unique diamond luster
Under the incandescent light of 100 degree, it is easy to see which diamond has diamond luster by comparing with the counterfeit. This method should not be carried out in too dark or too strong light.
Question 9: How to identify the authenticity of diamonds? There are many ways to identify the authenticity of diamonds. The simplest way is to go to a professional identification agency. There are other methods as follows:
(1) Look at the color: Because diamonds reflect light strongly, you can put your mouth against the diamonds to make them not reflect light, so that you can see the color more accurately. The order of color from good to bad is: colorless transparent (or crystal color) white, light yellow and yellow.
(2) Look at the purity of crystal transparency: This mainly depends on how many impurities are contained in the diamond. High-grade diamonds are still flawless when placed under a magnifying glass for more than ten times. Generally, those with few impurities are called "microfilaments", while those with many impurities are called "half flowers", "one flower" and "two flowers", and so on.
(3) Looking at the lathe operator: From the perspective of refraction, the diamond lathe operator's angle is accurate, and every angle and surface are the same. The higher the accuracy of this angle, the higher the grade of the diamond. Real diamonds have 57 or 58 reflecting surfaces (with a few exceptions).
(4) There is a simple way to identify genuine and fake diamonds, that is, if a diamond is put in your hand, you can't see the fingerprints, while fake diamonds such as rhinestones, white rubins (also known as synthetic diamonds) and Ceylon diamonds can see the fingerprints. Claudie's diamond ring is trustworthy.
Question 10: How can I tell if the diamond on the ring is genuine? People have invented and accumulated many very simple and practical methods to distinguish real diamonds from synthetic diamonds, crystals, glass or zircon without instruments.
It is often used by those who are more experienced to identify the authenticity of diamonds through manual models. Touching the crystal face of a diamond with your fingers will give you a sticky feeling, which is unique to real diamonds. Because diamonds have affinity for oil, and there is a trace of hand oil secreted from human finger skin, this skin oil will feel sticky when it comes into contact with the crystal face of the stone because of the affinity of diamonds for oil. And those other materials naturally don't have this special feeling. However, if the appraiser is inexperienced, it is still difficult to distinguish between genuine and fake diamonds, so this method should be used with caution. It is a relatively simple method to identify the authenticity of diamonds with a pencil. This was discovered by a Soviet expert before. This simple method is very popular with ordinary diamond lovers. Of course, it is definitely not absolutely reliable to use only a pencil to identify.
When identifying, you need to wet the diamond with water first, and then carve it gently with a pencil. On the crystal face of a real diamond, there is no trace where the pencil crosses, but if it is not a diamond, but a material such as glass and crystal, it will leave traces on the surface.
Generally speaking, pencils are used to identify diamonds. This method has high accuracy. But in the appraisal, we should pay attention to some inlaid old diamond jewelry, which is not suitable for water seepage, because if it is inlaid with copper or silver, it is easy to oxidize. In addition, generally speaking, the crystal face of a diamond also needs to avoid contact with oil, dust and objects.