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How to distinguish diamonds
Question 1: It's a little difficult to quickly tell whether a diamond is true or false with the naked eye, but there is a way. First, the most common diamond-like gemmology, such as zircon, mosanite and white crystal, has not been explained clearly for several years. Say it briefly.

1. If there is a diamond, draw a straight line on the white paper and turn the diamond upside down. Looking down from the bottom of the diamond, you can vaguely see the whole piece of black, mostly diamonds, while zircon can vaguely see two curves. The reason is that the fire color of zircon is stronger than the characteristic (refractive index) of diamond.

2, there is a simpler way, stick a little water with a small needle and drop it on the surface of the diamond. If the water drops suddenly disperse, it may be a diamond, because diamonds have the characteristics of lipophilic and hydrophobic.

3. There is another one. If you have an artificial ruby and sapphire (natural and a little wasteful), you can mark it with a diamond, which should also be a real diamond. Note that fakes can also be marked, but they can be erased by hand. This is done by the gemstone hardness method. Diamond has the highest hardness, then corundum (red sapphire) is removed, and then it is expected.

If your eyesight is good enough, you can look at a facet of the diamond, change your perspective and look at the fire color. Zircon is particularly bright, and you can see red light and blue light appear at the same time. If you really drill, you should see not only the red light, but also the blue light. The same characteristics as the first point.

If 1234 all see the same result, there is a great chance of real drilling.

I hope I can help you. If yes, please choose my best answer, and I will continue to answer for you.

Question 2: How to identify the authenticity of a diamond? 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.

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.

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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 3: How to distinguish diamonds from crystals? There are many ways to identify a diamond under the magnifying glass of 10 times. Combining the results of various methods, we can judge whether it is a diamond or not. Optical characteristics: Diamond luster is unique to diamonds, and most diamond imitations are glass luster, which is obviously different from diamonds. The fire color of diamonds also has certain characteristics. Some artificial imitation diamonds, such as cubic zirconia and synthetic rutile, have different dispersion from diamonds. Therefore, the colors in the spectrum become different. Surface and internal characteristics of diamond: In order to ensure the weight of diamond when cutting and polishing, the original crystal plane of diamond, such as triangular cone and stepped growth line, is often kept at the waist of diamond, which is the best way to judge diamond. The types and shapes of inclusions in diamonds are obviously different from synthetic imitation diamonds, and diamonds can also be identified according to their characteristics. Perspective test: draw a thin black line on white paper. Put the diamond table face down on the black line and observe the diamond from the pavilion. If you can't see the black line on the paper, it is a diamond, otherwise it is an imitation. Hydrophilicity test: Draw a line on the surface of a diamond with an oil-based pen. If clear lines are left on the surface, it is a diamond, while the imitation appears inter-strip phenomenon.

Question 4: How to tell whether a diamond is genuine or not? How to evaluate the quality of diamonds

The evaluation of diamonds should be based on the four standards of "clarity, color, cut and weight".

1. Clarity: Diamonds are natural products with some flaws. These defects are small crystals, clouds, pinholes and small cracks wrapped in the diamond during its growth. Clarity grading is carried out by professionals under the magnifying glass of 10 times. According to the size, quantity and location of the observed defects, it is divided into five grades, namely 10.

2. Color grading: Color grading is obtained by observing the obvious degree of yellow (brown) tone in yellow series diamonds, and the classification of diamond color grading is completed by professionals in a specific environment. The color of diamonds is divided into 12 grades, and different color grades are represented by English letters.

3. Cutting classification: Through the measurement and observation under the microscope, the quality of diamond cutting and grinding process is classified, and the ratio instrument is often used for classification. The degree of modification is the symmetry of diamond cutting and grinding and the evaluation of surface polishing quality. As a consumer, we should judge the quality of cutting from the following aspects: whether the diamond is bright, whether the fire color is obvious, whether the shape is symmetrical, whether the surface is damaged and so on.

4. Quality (commonly known as weight): it is an important factor to evaluate the value of diamonds. The mass unit of diamond is gram (g), which can also be expressed by (ct), lg=5ct. In fact, most of the weighing is directly weighed with a carat scale, and the carat value is reserved to two decimal places, and the third place is eight rounds.

According to the clarity and color grade of inlaid diamonds, the quality of inlaid diamonds is divided into five grades: excellent, very good, good, good and general. The influence of diamond cutting on quality is not considered.

How to buy diamonds

When buying diamonds, it is best to choose products from reputable diamond jewelry stores or famous manufacturers and shopping malls. Don't rush to buy, ask carefully to see if it is consistent with your knowledge in this field. Ask for invoices and quality guarantee. For the sake of prudence, you can go to a trusted jewelry appraisal station to get a "diamond appraisal certificate". This is the "physical examination form" and "ID card" of the diamond. If the product is accompanied by an appraisal certificate, the following criteria can be used to compare one by one ―― whether it conforms to the real thing, who appraised it, when is the date, whether it is filled in correctly and clearly, and whether there are any omissions. The price of diamonds is mainly determined by four indicators: clarity, color, cut and quality. In the total price of diamonds, weight accounts for 40% ~ 60%, clarity accounts for 15% ~ 25%, color accounts for 15% ~ 20%, and cutting accounts for 20% ~ 35%.

Say the weight first. The weight is priced by grades, such as 18' ~ 22' is 20', 23' ~ 27' is 25', and 28' ~ 39' is 30', and the price difference per carat is 3500 ~ 10000 yuan. Therefore, although the price difference between 22' and 23' and 27' and 28' is only 0.0 1 carat, there is a grade difference in price, and the price difference is 350 ~ 1000 yuan. If you choose the weight reasonably, you will save money

There are five grades of clarity, and the colors are 1 1 grade. Their relationship is as follows: the clarity difference is 10% ~ 15%, that is, the clarity difference of VVS, VS and ST is 3000 ~ 5000 yuan per carat, which is 3000 yuan different from that of 1 piece with the same weight.

Colors are divided into three categories, 1 1 grade, price difference between types 10% ~ 15%, and difference between grades 10%. For example, a VS white diamond of about 3000 yuan, the color accounts for 450 yuan in the price. For the same VS white diamond, the difference between J and H can be 20%, which is the difference 90 yuan. Cutting accounts for 20% ~ 35% of the total price. Based on 30% calculation, the benchmark cutting price of a 3,000-yuan diamond is 900 yuan. Because the quality of cutting affects the degree of "fire" and the size of the ring surface, different cutting workers have certain price differences, with the lowest cutting in Hong Kong and the highest cutting in Belgium. Generally, Belgian cuttings are 25% ~ 30% higher than Israeli cuttings, and Israeli cuttings are 65,438+05% higher than Indian cuttings. For example, an Indian cut diamond worth 3,000 yuan (900 yuan cut), Israeli cut 1035 yuan, Belgian cut 1290 ~ 1350 yuan. Therefore, a 3000 yuan Indian cut VS white (J-grade) diamond is replaced by an Israeli or Belgian cut VS white (H-grade) diamond, and its price is about 3225 ~ 3540 yuan.

The proportion of brands in the price is still uncertain. Because the jewelry industry in China has started ... >>

Question 5: 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 hot needle touches the diamond to be measured. If it is a real diamond, the heat on the hot needle will soon be transmitted from the real diamond, and the light emitting diode of the thermal conductivity meter will display it and chirp at the same time. If the hot needle touches the "Soviet diamond" or other gems 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.

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Prove that there must be.

Now it's the overlord clause, so we can only sell it and not refund it.

Question 6: How to judge whether it is a diamond? First of all, look at whether the diamond has a certificate and whether the certificate is issued by an authoritative organization, such as GIA and NGTC.

If there is a certificate, check whether the certificate corresponds to this diamond. If it is certified by GIA, there will be a laser code on the waist of the diamond, which corresponds to the code on the certificate. If the laser code on the diamond corresponds to that on the certificate, then it can be determined that it is.

If you don't have a certificate, or the two can't match, or you are really worried, you can find a qualified jewelry appraisal center for appraisal, and the cost will not be very high.

Question 7: How to distinguish good diamonds from bad ones? The quality evaluation of diamonds is to look at the 4C of diamonds. The higher the grade, the better the diamond.

1. Color: Generally, diamonds are Cape series, with colors ranging from white to light yellow and from high to low D-E-F-G-H-

n .。 . . . Z. Among them, everything above H color looks very white, and everything below H color can be seen a little.

Yellow * * * hue, the more backward, the worse the color scale. (colored diamond does not belong to this grading system, so it is necessary.

Classified separately, red diamonds are extremely expensive, and blue diamonds are also very expensive. )

2. Clarity: Describe the number of internal and external defects in a diamond. The cleaner the better. The best is LC, followed by VVS and vs.

Those below Si and P .P levels belong to the heavy defect level, and the dirty things inside are visible to the naked eye.

3. Cutting: Diamonds can produce fire colors. Apart from their own quality, they also depend on cutting and polishing techniques. Only good cutting and grinding can

Let diamonds play their best role. Including cutting and grinding ratio (table width ratio, pavilion depth ratio, waist thickness ratio, crown angle ratio)

The ratio of bottom to top), polishing quality and modification degree. The best of these three items is Exelent, and then it is very good.

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4. Carat: Of course, the heavier the better. Diamonds larger than 0 carat can be named separately.

The place of origin is not of great significance to diamonds, so it is generally not said.

The above is the 4C classification of diamonds. Of course, if you look at the price, in addition to these 4Cs, it depends on the place of purchase, brand, mosaic technology and so on.

Your diamonds are relatively high in color and clarity, and the cutting is very general. On the whole, it's good.

Question 8: How to distinguish between genuine and fake diamonds? A simple way to distinguish 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.

First of all, we can judge the authenticity of diamonds from two aspects: color and clarity. The color of synthetic silicon carbide is generally yellow, which can be clearly felt by the naked eye, even more yellow than the light yellow and white diamonds sold in the market. With the help of a magnifying glass, it can also be observed that there are thin tubular inclusions and obvious surface edge ghosting phenomenon. Secondly, when consumers buy diamond jewelry, they must ask the merchants for a diamond appraisal certificate or a diamond grading certificate to ensure the quality of the diamond jewelry they buy.