The main characteristics of diamond are: excellent thermal conductivity, extremely high hardness, typical diamond luster, beautiful and soft dispersion, high refractive index, isotropic body, intersection of sharp edges and the corresponding relationship between standard cutting diameter and weight. Therefore, the identification of diamonds generally starts from these angles.
First, introduce several simple identification methods in daily life without the help of professional tools:
A, "stroke recognition method"
Because diamonds are lipophilic, you can draw on the diamond table with an oil pen (or a commonly used signature pen). Don't worry, real diamonds don't leave scratches. If the lines drawn are coherent, it means that they are real diamonds. If the lines are not obvious or discontinuous, there is probably something wrong. Considering the quality of ballpoint pen, you can draw more times. ).
Second, the "breath recognition method"
Natural diamonds have good heat transfer ability and fast heat dissipation. When the diamond to be tested is close to the mouth, breathe gently to cover the diamond to be tested with a layer of light fog. At this time, immediately pay attention to the evaporation of the diamond fog. If it is a natural diamond, the fog will dissipate immediately. Otherwise, the fog will stay on the fake diamond for a while and then dissipate.
Iii. [Water Drop Identification Method]
Wipe the top surface of the diamond and dip a toothpick in a drop of water. The water droplets on a real diamond will be medium-sized round water droplets. The water droplets on the fake diamonds will soon disperse.
Four, [pencil identification method]
After the diamond is wet with water, scratch it with a pencil, and there will be no pencil marks on the surface of the real diamond. Transparent fake diamonds such as crystal, glass and tourmaline will leave traces.
Verb (abbreviation of verb) [representation recognition method]
Diamond is so hard that it is difficult to leave a notch on it with a blade or something. In addition, a slight scratch on the glass with diamonds will leave more obvious white marks. Fake diamonds do not have this phenomenon.
Six, [optical identification method]
Real diamonds have the characteristics of single refraction, radiant and dazzling brightness, but you can't see fingerprints when you wear them on your hands. Fake diamonds, such as crystals, have poor dispersion and low refractive index, and fingerprints can be seen through the crystals.
Clean the diamond and put it on a piece of lined paper with the table top (the biggest side of the diamond) facing down. If the diamond is cut in a standard way, the lines on the paper are invisible through the diamond, while most imitations allow enough light to pass through, at least some lines can be seen.
VII. 【 Touch Recognition Method 】
Because diamonds have affinity for oil, and people's finger skin will secrete some trace oil, gently touching the crystal face of diamonds with fingers will have a sticky feeling. Use a magnifying glass, but this method requires some experience. Try it several times with your hands and slowly cultivate your feelings. For the finished diamond that has been inlaid, you can touch it by hand and check it with a magnifying glass, and you will find that the diamond is stained with more oil than the diamond substitute or other gems.
Eight, "contact identification method"
Diamond is crystalline carbon with excellent thermal conductivity. If you touch the diamond with your tongue, cheeks and the back of your hand, the human body is at a constant temperature. If the diamond heats up, it is an imitation. Real diamonds cool if they are left for a long time.
Here are several identification methods that rely on professional tools or complex points:
Nine, [cut mirror identification method]
Looking at diamonds through the cutting mirror, we will find that the interior of natural diamonds is dazzling and has complicated sections. On the other hand, other fakes are bland, with few sections or even completely invisible.
X.[ Identification method of thermal conductivity meter]
The accurate and reliable way to distinguish between true and false diamonds is to measure the thermal conductivity of various diamond substitutes or counterfeit products with a diamond tester (that is, a thermal conductivity meter), and the problem of distinguishing between true and false diamonds will be solved. According to the maximum thermal conductivity of diamond, it is detected by diamond thermal conductivity meter. If it is natural, you can make the thermal conductivity meter buzz and light up a red light. This is the most accurate and simple way to identify diamonds.
XI。 [Hardness tester identification method]
Measuring hardness with "standard hardness tester" is also a simple and reliable method to identify diamonds. The "Standard Hardness Tester" is a rectangular box with the size of only 65×55×23 mm After the cover is opened, there are four standard hardness tablets with a mirror-like surface, and their Mohs hardness is 6, 7, 8 and 9 respectively. As long as the standard part with hardness of 9 is scratched with a diamond, if it can scratch the scar, it is a real diamond, and if it can't, it proves that its hardness is less than 9 or equal to 9, it is a fake diamond.
Twelve. [Certificate query and authentication method]
Jewelry merchants generally provide jewelry appraisal certificates when purchasing finished diamonds that have been inlaid. This is the most accurate and detailed description of the quality of diamonds. The providers of appraisal certificates have professional and authoritative positions in the industry, and the reliability of certificates can only be inquired through relevant websites. Just ... >>
How to tell whether a diamond is genuine or not?
Identify diamonds:
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.
How to tell the quality of a diamond ring?
Hey, my family is like this. You can ask me directly. . . . Diamonds have loose diamonds. Bare diamonds can be understood as bare diamonds. Can you understand? Mainly the cutting surface of diamonds. Good diamonds have no flaws at all. You have to look at it with a magnifying glass of 10 times. The place where diamonds are sold has an appraisal certificate. Simply put, diamonds look like 4c. After these four C's, there are English words. I just wrote it for you. I don't know what to read. C cutting, c clarity, c color, c carat.
Colored diamonds are an exception. There are diamond segment identification certificates at home and abroad. It says that EX perfect VG is very good, and all three grades of G are good. Generally, there will be no mistakes in this certificate. What matters is color and cleanliness. Do you want to get married? Let me tell you something, Dabao. Just buy a hexagon. The cut looks brighter. More beautiful. If you want to buy a one-carat diamond ring. You can buy something smaller than 1 carat. People can't see that this is not 1 carat. About the same size. But the price can be saved a lot. The color classification of diamonds is as follows: D E F G H I J K L M D is the best, and the back is getting more and more yellow, so G is whiter than I. If you buy a diamond ring, you must go to the appraisal center to see how many points the appraiser gives you. To put it bluntly, if the appraiser can identify you with 99 points, then the diamonds you buy will never be cheap. Because the people who sell diamonds have been identified by themselves and the price is very high. Haha, do you call me awesome? There should be no better answer than me, right? Haha'
Identification method of diamond ring
1. Diamonds are very lipophilic: the identification method of diamond rings is to gently touch the crystal face of diamonds with your fingers, which will make them feel sticky. This viscosity is unique to real diamonds. Because diamonds have affinity for oil, there is a trace of hand oil secretion on human finger skin. This skin oil is in contact with the crystal face of the stone. It will feel sticky because of the affinity of diamonds for oil, and other materials will naturally not have this special feeling. 2. Using the refractive characteristics of diamond: The identification method of diamond ring is to draw a straight line on a piece of white paper, put the diamond flat on this straight line, and observe this straight line through the diamond. If the lines at both ends of the diamond edge are broken or deformed, it can be concluded that it is a real diamond. If the line is still straight, it is a fake diamond. 3. Thermal conductivity of diamond: (2) Breathe to the diamond. If the water vapor on the diamond disappears immediately, it proves to be a real diamond. If the water vapor stays on the diamond for a few seconds, it is a fake diamond. 4. Chemical composition of diamond: First, wet the diamond with water, and then lightly carve it with a pencil. On the crystal face of a real diamond, there is no trace where the pencil crosses, instead of glass and pencil. It will leave a mark on the surface. 5. Hardness of the diamond: The hardness of the diamond is very strong, and it is difficult for the diamond ring identification method to leave a notch on it. In addition, slight scratches on diamond-encrusted glass will leave more obvious white marks. Fake diamonds do not have this phenomenon. In other words, the diamond rubs back and forth on the fine sandpaper several times, and those with scratches on the surface are fake diamonds, while those without scratches are real diamonds. For consumers. The company provides good quality and credit guarantee, which has been well received and recognized by the industry.
How to distinguish various rings?
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: When real gold with a purity of over 99% is thrown on the hard ground, it will beep, without rhythm 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.
Find out the manufacturer and color by naked eye observation.
The surface of regular brand gold jewelry should be marked with the manufacturer and alloy purity (fineness), and the text should be clear and delicate. If there is no mark on the jewelry, or the mark is rough and fuzzy, it is necessary to doubt the reliability of gold jewelry. Check colors and changes. Gold should be bright red and yellow with a lasting color. The higher the fineness, the more beautiful the color. On the other hand, if the color is not enough, as long as it contains 0.0 1% copper or silver, its color will be slightly purplish red or bluish white, so people often say "seven green, eight yellow, nine five red".
The so-called gold jewelry is made of other metals and can be identified by its color. Auditory sound discrimination component. If jewelry falls naturally from a height, if it only makes a "beep" sound, and the tone is low and lacks elasticity, then the fineness of gold is high. If the sound is crisp and elastic, it means that the color is not high, and the jewelry contains more metal components such as copper.
Hand balance method of comparing weights by hand.
The easiest way is to weigh by hand. As the saying goes, gold "presses the hand" because the same volume of gold is much heavier than other metals such as copper. The specific gravity of gold is 19.3, which is higher than that of silver, copper, aluminum, tin and other metals. At the same volume, gold is 40% heavier than silver, 1.2 times heavier than copper and 6. 1 times heavier than aluminum. By comparing the weights, we can identify whether other metals are used to fake gold ornaments. Identification of real gold by bite mark method. Gold has low hardness and is relatively soft. If you bite with your teeth, 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, copper and copper, it is not easy to bend. This method can be used to identify whether gold ornaments are shoddy or not. Licking your tongue can tell the truth from the false. 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 is sweet, it means copper. As the saying goes, "fire and water are incompatible", but Jin is indifferent to fire and water. If possible, you can use the "fire and water solution" to see the true face of jewelry. Fire knows the truth. "Real gold is not afraid of fire" will make jewelry cool after high temperature fire. If it is still yellow and does not deform, it is yellow; If it turns black, it is a counterfeit product made of other metals. There is nitric acid to distinguish authenticity. 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 >>
How to identify Chow Tai Fook diamond ring ...
Chow Tai Fook is a big brand and should be more reliable. If you are not at ease, you can take the diamond ring to the national diamond appraisal agency for further testing and issue a certificate for comparison. The cost is about 30-50 yuan.
How to tell if it is a diamond?
Diamonds and glass: First of all, it is certain that the fire color of diamonds is the highest among all natural transparent gems! (The so-called fire color is actually dispersion-that is, the ability to decompose white light into seven colors of light) Then, the fire color of glass is quite low, so this is "Method 1": the fire color of diamond is higher than that of glass! Method 2: Diamond is lipophilic (that is, diamond can adsorb oil), while glass is hydrophilic. So, if you put diamonds and glass in grease and take them out, the diamonds are greasy and the glass looks clean. Method 3: The hardness of diamond is the highest, while the hardness of glass is quite low (only the hardness of knife). Therefore, prepare a quartz stone (crystal). The carving of diamonds will leave permanent and irreversible damage, but the glass will not cause any damage! Distinguish between true and false diamonds: 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. 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.
How to identify the authenticity of diamond ring
It is really important to identify the authenticity of diamond rings. I hope it will help you read.
(1) cloud mask of jewelry and diamond identification certificate, including grafting, cloning and copying, using "group ID card";
(2) The diamond ring is only marked with English letters or Chinese Pinyin, and the name, composition, content and special treatment are not marked according to the manual (deceiving consumers to know about jewelry knowledge and deliberately making people unable to understand it);
(3) Artificial natural jewelry is a genuine pearl, which is obviously artificial but not marked as artificial;
(4) Jadeite jade jewelry is stacked in a crooked way, and the common methods are dyeing, filling, padding and splicing.
(5) Pass "crystal glass" as crystal, "topaz" as sapphire, "Ma Laiyu" as jadeite and "artificial silicon carbide" as diamond;
(6) The jadeite that has been artificially pickled, waxed and colored passes off as natural A goods;
(seven) the price of jewelry is uncertain, and the false discount after raising the original price without authorization disturbs the market and deceives consumers;
(8) Deduct the weight of the diamond ring. According to the national measurement regulations, the decimal circle of a diamond is not rounded, but one ninth. Illegal vendors use mosaic molding, which is difficult for customers to calculate. For example, 19.8 points, even 19.7 points and 19.6 points are marked as 20 points and so on. But they don't know that the weight of a carat ranges from several hundred yuan to thousands.
(9) It is difficult to accurately measure the specific values such as the width ratio and pavilion depth ratio of inlaid diamond ornaments, and individual businesses have drilled detection loopholes, which are collectively called "perfect and high quality" to fool consumers;
(10) exaggerates the concept of publicity and hype, making consumers deceived.
How do you know if yours is a diamond ring? how do you know
Diamonds have high refraction, high dispersion and high hardness of 10 mohs ~ and there are many ways to distinguish diamonds, such as breathing drawing. The real diamond's breath will dissipate immediately on the surface, but the fake one will not. The way to draw a picture is that if the real diamond has a refraction fake diamond, you will see that line.
How to identify the quality of a diamond ring?
Buying diamond ornaments is an unusual thing. A complete evaluation of a diamond can only provide the most detailed quality information by relying on the 4C certificate of diamond and diamond appraisal.