4 thoughts on “How to identify the authenticity of jewelry?”
Jimmy
I: magnifying glass zircon is very similar to diamonds and is the best substitute for diamonds. The identification method is that the zircon has polarization and great birefringence. When the processed zircon prism is observed with a 10x magnifying glass, it can be seen that there is obvious double shadow on the bottom ridge line from the top surface, while there is no double shadow on the diamond II: portable microscope with the progress of science and technology, glass products are most counterfeited and often confused with real ones. It is difficult for many old experts to identify with the naked eye. It is easy to identify glass products with the help of portable microscope (such as eniti, Diguang, etc.). Since there are bubbles in the glass products during the production of the eniti microscope to view the jewelry map, the bubbles in the glass can be clearly seen when the glass products are viewed with a portable microscope and magnified to 200 times. Whereby it can be distinguished whether it is a glass product or not III: spectrometer currently, there are many spectrometers used for jewelry identification. Opal3000 Pro jewelry identification spectrometer of Fuxiang technology has improved the sample test method of the original jewelry identification equipment. It has an open sample operation platform and can measure various jewelry samples more conveniently and quickly. It is very suitable for laboratory use IV: pen type spotlight flashlight: it is used to observe the transparency of dark colored gems. The electric ball of the concentrated flashlight shall be concave on the surface of the pen head, and shall not protrude from the surface of the pen head, otherwise it is not convenient for observation.
What kind of jewelry do you need to identify? Different jewelry has different identification methods for jadeite identification some people say that if a piece of green jadeite is photographed with a Dow color filter, if it turns into red, it can show that the jadeite is dyed, and if it does not change color, it is the true color. This kind of saying is very mechanical, and it is the understanding of others we know that Dow color filter is a kind of color filter film, which only allows red and orange light to pass through. The fuel used to dye jadeite generally contains chromium salt. When its concentration is very high, it will emit red light, and it will appear red under the Dow color filter. However, if the color is not deep, the chromate concentration is not high, and it is slightly red under the Dow color filter, which is not easy to observe. In addition, natural green jadeite sometimes contains a small amount of substances that emit red light. Therefore, when observing green jadeite with a Dow color filter, you should carefully analyze it. It will have an instructive effect and cannot make a conclusive judgment then what is the difference between the natural green of jadeite and the dyed green? We have already known the reason for dyeing jadeite, and the reason why natural jadeite has green, white and purple is that the grains that make up jadeite are green, white and purple. Therefore, when we look at the color of a natural jadeite, there is no boundary between its color and crystal. For the dyed jadeite, its original crystal has no color. The dye that enters the jadeite after impregnation is infiltrated along the grain gap or some fine cracks of the crystal. Therefore, there is a clear boundary between the color and crystal identification of diamonds diamonds are the hardest substance in natural materials. Diamonds can engrave any other gemstone, but any other gemstone can not engrave diamonds. It can also be scored with a "standard hardness tester". Any hardness less than 9 degrees is a fake diamond. Diamonds are also lipophilic. If you draw a line on the surface of diamonds with a pen, it will become a continuous straight line, while other gemstones will show intermittent lines. The above methods have certain reference value in the identification of diamonds. It can also be observed through a 10x magnifying glass. Under the 10x magnifying glass, most diamonds can see haze defects and triangular growth lines. The surface of diamonds has "fire" light of "red, orange, blue" and other colors. The light shines everywhere. The most accurate and reliable method is to use a "thermal conductivity meter" to measure the thermal conductivity data to distinguish genuine and fake diamonds, but the "thermal conductivity meter" is expensive as diamonds are the first jewelry of noble luxury, it is not uncommon to substitute or fake diamonds with cheap gemstones, artificial gems and even glass in the market. The common fake diamonds are as follows: ① ZIRCON: very similar to diamonds, it is the best substitute for diamonds. The identification method is that the zircon has polarization and great birefringence. When the processed zircon prism is observed with a 10x magnifying glass, it can be seen that there is obvious double shadow on the bottom ridge line from the top surface, while there is no double shadow on the diamond ② glass: the refractive index of glass is very low, and there is no glittering color light like diamond; In particular, when immersed in the water, the glass products have no luster, and the horse's feet are immediately exposed ③ Soviet drill: cubic zirconia, which was first developed by the Soviet people, hence its name. Soviet diamond is an artificial compound, but it is very similar to natural diamond in dispersion and refractive index, and also has the attractive appearance of "fire" sparkle. But its hardness is low (8.5) and it can be distinguished from diamonds. And the thermal conductivity is far lower than that of diamond, which can be identified by "thermal conductivity meter" to accurately distinguish them ④ crystal: Although the crystal is a natural mineral transparent crystal and looks like a diamond after processing, it lacks the color light of a diamond identification of ruby Natural Ruby is "ten red and nine crack". Natural ruby without any defect and crack is extremely rare. However, the artificial ruby has the same color, few internal defects or crystalline inclusions, and is clean and large. As precious gems, natural rubies with more than 3 carats in the market are very rare. If you encounter a large ruby, you should pay attention to it, because the value of natural ruby is hundreds of times higher than that of artificial ruby. If you neglect it, you will "take medicine" Natural Ruby has strong "dichroism", that is, there are two colors of red and orange red from different directions. If there is only one color, it may be red spinel, garnet or red glass red spinel is very similar to natural ruby, and the two are easy to be confused, so special care must be taken identification of sapphire the color of natural sapphire is often uneven, and most of them have straight growth lines. The color of artificial sapphire is consistent, and its growth pattern is arc-shaped belt. It can often be seen that there are breadcrumb like or bead like bubbles in the body Natural Sapphire also has obvious dichroism, which is blue from one direction and blue-green from the other direction. Other gemstones are different from natural sapphires in color rendering, so they can be distinguished in addition, the simplest method can be hardness measurement. Natural sapphires can carve marks on topaz, while other blue gems can hardly carve marks on topaz. Therefore, when buying jewelry, if there is no instrument nearby, as long as there is a topaz, some problems can be solved identification of cat's eyes in recent years, there is a kind of glass fiber cat's eye ring face on the market, which is inlaid on gold or silver rings, making it difficult to distinguish between genuine and fake. The identification method is that when the ring surface is rotated, several light bands can appear on the arc top of the false cat's eye at the same time, while there is only one real cat's eye. The false cat's eye eyeliner is rigid, while the real cat's eye eyeliner is flexible. The color of real cat's eyes is mostly brown yellow or light green, while the color of false cat's eyes is diverse, including red, blue and green emerald is a gem with hardness second only to diamond and red sapphire. Gold emerald, variant metalith and opal are not only very beautiful, but also very rare, so the price is very high. After kapson's cutting, the opal with developed vacuum like inclusions inside the opal will show color change effect identification of opal opal can be divided into black opal, White Opal and yellow opal according to its color, among which black opal has the highest price. In order to upgrade the lower priced white or yellow opal, some people use artificial methods to change its color and become "black opal" to make high profits. The main method is to boil with sugar or inject plastic to make the White Opal black. The identification method is that the specific gravity of opal after sugar boiling or injection molding is obviously different. When tested in water, the specific gravity becomes lighter. The heated needle can also be used to test the injection molding opal. The natural opal hot needle can not penetrate, and the injection molding opal can penetrate, and will produce the odor after the plastic is closed identification of tourmaline tourmaline is a medium-grade gemstone, but because peach red and bright blue tourmaline are more valuable, there are also counterfeit products. There are two kinds of common counterfeit products: one is artificial coloring with colorless tourmaline; One is made of red glass. The identification method is that true tourmaline often has obvious dichroism, and double shadows can be seen; Tubular inclusions or cotton batts can be seen in the body, and the cross section of the crystal is arc triangle. These characteristics are not possessed by counterfeit products. The workers' dyed tourmaline is not difficult to identify because of its sluggish color and lack of "Baoguang" of natural tourmaline identification of crystals natural crystals are clear and transparent, often contain cloud like, star like or flocculent gas-liquid inclusions, and often have microcracks. In addition, natural crystals have polarizing property, and double crystal phenomenon can be seen. For example, when a crystal sphere is seen from above, double shadows can be seen. Synthetic crystal or glass products are uniform and pure in the body, without cracks, and there are often small bubbles inside. The double shadows of the lines below the sphere can not be seen from the top to the bottom. By hand recognition, it can be felt that the proportion of synthetic crystal is greater than that of natural crystal; Natural crystal has a cold feeling, while glass has a warm feeling identification of olivine olivine is a green to yellow, olive like medium and low-grade gemstone. It is the most common imitation of olivine made of colored glass in the market. The main difference between the two is that olivine has obvious "double shadow", while glass does not; Crystalline inclusions are often found in olivine, and only bubbles are contained in the glass; Olivine has a specific gravity of 3.5 and a hardness of 7, which is larger than the specific gravity (2.6) and hardness (6) of glass identification of pearls pearls are divided into natural pearls and cultured pearls, and cultured pearls are divided into seawater pearls and freshwater pearls. The output of natural pearls is small and the price is high; The cultured pearls can be produced in large quantities, so the price is much lower. The main difference between the two is that natural pearls and cultured pearls have no nuclei. The core of natural pearls is often only some sand or parasites, or even no core. The inner core of cultured pearls is large round pearls made artificially, so the outer coating is thin. On the body surface, natural pearls have poor roundness because of their random growth environment, few foreign bodies in the nucleus roll. The inner core of cultured pearls is round, so the roundness of pearls is better. Due to the long growth time of natural pearls, the texture of pearls is fine, the bead layer is thick, the skin is smooth, there are few "convex bubbles", and it is transparent. For cultured pearls, the sound is short when they become pearls, so the pearl layer is thin, the texture is rough, the luster is "waxy", and there are often some concave and convex "bubbles" on the surface, and the transparency is poor. If it is a perforated pearl, use a magnifying glass to carefully observe the hole. If it is a cultured pearl, you can generally see a brown boundary in the Pearl, which is the boundary between the inserted core and the pearl layer grown later.
How to identify the authenticity of jewelry due to the special value of jewelry, the most basic requirement of people is that it is genuine. Putting aside the price factor, how to ensure that people are not deceived by fake goods has become the most concerned issue and also the most worrying issue for consumers. The professional testing institutions certified by the national certification authority, with professional, authoritative and fair identification, check the quality of jewelry for consumers, and become an important basis for consumers to spend with confidence. Formal jewelry sales should be accompanied by identification certificates to clarify the quality of jewelry and ensure the right to know of consumers. Therefore, when buying jewelry, consumers must not forget to ask for the identification certificate, and carefully check whether the corresponding contents of the commodity label and the certificate are consistent, especially the number and photos. What if I worry about buying fake diamonds? Many friends are afraid of buying fake diamonds when they buy diamonds for the first time. In fact, as long as they pay attention to three factors, there is no need to worry: 1. Judge whether the business is really engaged in jewelry business. Because the reputation of this industry is very important, if you sell fake goods, you will be uniformly isolated, so the gains outweigh the losses, and generally there will be no fake goods. However, we should be careful of two kinds of stores: one is the shops in tourist attractions, and the other is the women's shops mainly engaged in various small ornaments. If these two shops claim to have real diamonds and real Jadeites, be careful! 2. There is no need to worry about buying synthetic diamonds. Here I can definitely tell you: don't worry, you can't buy synthetic diamonds! Because synthetic diamonds are more expensive than natural diamonds. The synthetic diamond mentioned here only refers to the compound with the same molecular shape. If it is polished into 57 or 58 standard faces, the cost will be higher. Synthetic diamonds were first developed by Japan in 1955, but they were not mass produced. Because synthetic diamonds are more expensive than natural diamonds, synthetic diamonds are rare in the market. 3. There is no need to worry about buying fake diamonds and other cheap gems, such as colorless gems, colorless spinels, zircon, strontium thorium, yttrium aluminum matte, yttrium gallium garnet, etc. To solve this problem is actually very simple: trust our appraisal institution! As long as we can issue the appraisal certificate of an appraisal institution with certain qualifications, we think there is generally no need to worry. Scientific maintenance of diamonds 1. Diamonds should be stored separately. Do not put it together with other ornaments to avoid damaging the essence of diamonds by friction or oxidation. It's better to buy a few small boxes containing diamond ornaments and collect them separately. 2. It is absolutely necessary to wear diamond ornaments after putting on makeup and spraying perfume. Because diamonds have oil absorption, grease or dust will stick to the surface of diamonds and make them dull. It is recommended that you soak it with alkaline detergent and water for 1-3 minutes, and then rinse it with clean water. 3. Try to pay attention to whether the diamond ornaments on your body are torn off when you wear sweaters or knitted clothes. After all, diamonds are not cheap. Cleaning of diamonds like other objects, diamonds can be smoked, stained or stained with dust. All kinds of solvents, powders, soaps and even oils produced by human body will form films on the surface of diamonds, reducing the luster of diamonds. In addition, air may oxidize or discolor jewelry. The following recommended cleaning methods for diamonds are as follows: 1. Rinse with detergent. First, pour a little detergent into the bowl and stir it with warm water to form foam. Then, put the diamonds into the bowl and gently wipe them with a soft brush. After brushing, take out the diamonds and put them into a metal mesh or tea filter. Rinse them with warm water and dry them with a soft cloth. 2. Soak in cold water: dissolve the detergent in cold water at the ratio of 1:4, and put the diamond ring into the solution for several minutes. Take it out and gently wipe it with a soft brush, then rinse it with solution once, and then wipe it dry with a paper towel. 3. Cold water immersion method: add the same amount of water to half a cup of family amonia water, immerse the diamond in the solution, gently stir, and then use paper to absorb the water. In addition, the use of ultrasonic cleaners and other special jewelry cleaners is also good.
I: magnifying glass
zircon is very similar to diamonds and is the best substitute for diamonds. The identification method is that the zircon has polarization and great birefringence. When the processed zircon prism is observed with a 10x magnifying glass, it can be seen that there is obvious double shadow on the bottom ridge line from the top surface, while there is no double shadow on the diamond
II: portable microscope
with the progress of science and technology, glass products are most counterfeited and often confused with real ones. It is difficult for many old experts to identify with the naked eye. It is easy to identify glass products with the help of portable microscope (such as eniti, Diguang, etc.). Since there are bubbles in the glass products during the production of the eniti microscope to view the jewelry map, the bubbles in the glass can be clearly seen when the glass products are viewed with a portable microscope and magnified to 200 times. Whereby it can be distinguished whether it is a glass product or not
III: spectrometer
currently, there are many spectrometers used for jewelry identification. Opal3000 Pro jewelry identification spectrometer of Fuxiang technology has improved the sample test method of the original jewelry identification equipment. It has an open sample operation platform and can measure various jewelry samples more conveniently and quickly. It is very suitable for laboratory use
IV: pen type spotlight flashlight:
it is used to observe the transparency of dark colored gems. The electric ball of the concentrated flashlight shall be concave on the surface of the pen head, and shall not protrude from the surface of the pen head, otherwise it is not convenient for observation.
What kind of jewelry do you need to identify? Different jewelry has different identification methods for jadeite identification
some people say that if a piece of green jadeite is photographed with a Dow color filter, if it turns into red, it can show that the jadeite is dyed, and if it does not change color, it is the true color. This kind of saying is very mechanical, and it is the understanding of others
we know that Dow color filter is a kind of color filter film, which only allows red and orange light to pass through. The fuel used to dye jadeite generally contains chromium salt. When its concentration is very high, it will emit red light, and it will appear red under the Dow color filter. However, if the color is not deep, the chromate concentration is not high, and it is slightly red under the Dow color filter, which is not easy to observe. In addition, natural green jadeite sometimes contains a small amount of substances that emit red light. Therefore, when observing green jadeite with a Dow color filter, you should carefully analyze it. It will have an instructive effect and cannot make a conclusive judgment
then what is the difference between the natural green of jadeite and the dyed green? We have already known the reason for dyeing jadeite, and the reason why natural jadeite has green, white and purple is that the grains that make up jadeite are green, white and purple. Therefore, when we look at the color of a natural jadeite, there is no boundary between its color and crystal. For the dyed jadeite, its original crystal has no color. The dye that enters the jadeite after impregnation is infiltrated along the grain gap or some fine cracks of the crystal. Therefore, there is a clear boundary between the color and crystal
identification of diamonds
diamonds are the hardest substance in natural materials. Diamonds can engrave any other gemstone, but any other gemstone can not engrave diamonds. It can also be scored with a "standard hardness tester". Any hardness less than 9 degrees is a fake diamond. Diamonds are also lipophilic. If you draw a line on the surface of diamonds with a pen, it will become a continuous straight line, while other gemstones will show intermittent lines. The above methods have certain reference value in the identification of diamonds. It can also be observed through a 10x magnifying glass. Under the 10x magnifying glass, most diamonds can see haze defects and triangular growth lines. The surface of diamonds has "fire" light of "red, orange, blue" and other colors. The light shines everywhere. The most accurate and reliable method is to use a "thermal conductivity meter" to measure the thermal conductivity data to distinguish genuine and fake diamonds, but the "thermal conductivity meter" is expensive
as diamonds are the first jewelry of noble luxury, it is not uncommon to substitute or fake diamonds with cheap gemstones, artificial gems and even glass in the market. The common fake diamonds are as follows:
① ZIRCON: very similar to diamonds, it is the best substitute for diamonds. The identification method is that the zircon has polarization and great birefringence. When the processed zircon prism is observed with a 10x magnifying glass, it can be seen that there is obvious double shadow on the bottom ridge line from the top surface, while there is no double shadow on the diamond
② glass: the refractive index of glass is very low, and there is no glittering color light like diamond; In particular, when immersed in the water, the glass products have no luster, and the horse's feet are immediately exposed
③ Soviet drill: cubic zirconia, which was first developed by the Soviet people, hence its name. Soviet diamond is an artificial compound, but it is very similar to natural diamond in dispersion and refractive index, and also has the attractive appearance of "fire" sparkle. But its hardness is low (8.5) and it can be distinguished from diamonds. And the thermal conductivity is far lower than that of diamond, which can be identified by "thermal conductivity meter" to accurately distinguish them
④ crystal: Although the crystal is a natural mineral transparent crystal and looks like a diamond after processing, it lacks the color light of a diamond
identification of ruby
Natural Ruby is "ten red and nine crack". Natural ruby without any defect and crack is extremely rare. However, the artificial ruby has the same color, few internal defects or crystalline inclusions, and is clean and large. As precious gems, natural rubies with more than 3 carats in the market are very rare. If you encounter a large ruby, you should pay attention to it, because the value of natural ruby is hundreds of times higher than that of artificial ruby. If you neglect it, you will "take medicine"
Natural Ruby has strong "dichroism", that is, there are two colors of red and orange red from different directions. If there is only one color, it may be red spinel, garnet or red glass
red spinel is very similar to natural ruby, and the two are easy to be confused, so special care must be taken
identification of sapphire
the color of natural sapphire is often uneven, and most of them have straight growth lines. The color of artificial sapphire is consistent, and its growth pattern is arc-shaped belt. It can often be seen that there are breadcrumb like or bead like bubbles in the body
Natural Sapphire also has obvious dichroism, which is blue from one direction and blue-green from the other direction. Other gemstones are different from natural sapphires in color rendering, so they can be distinguished
in addition, the simplest method can be hardness measurement. Natural sapphires can carve marks on topaz, while other blue gems can hardly carve marks on topaz. Therefore, when buying jewelry, if there is no instrument nearby, as long as there is a topaz, some problems can be solved
identification of cat's eyes
in recent years, there is a kind of glass fiber cat's eye ring face on the market, which is inlaid on gold or silver rings, making it difficult to distinguish between genuine and fake. The identification method is that when the ring surface is rotated, several light bands can appear on the arc top of the false cat's eye at the same time, while there is only one real cat's eye. The false cat's eye eyeliner is rigid, while the real cat's eye eyeliner is flexible. The color of real cat's eyes is mostly brown yellow or light green, while the color of false cat's eyes is diverse, including red, blue and green
emerald is a gem with hardness second only to diamond and red sapphire. Gold emerald, variant metalith and opal are not only very beautiful, but also very rare, so the price is very high. After kapson's cutting, the opal with developed vacuum like inclusions inside the opal will show color change effect
identification of opal
opal can be divided into black opal, White Opal and yellow opal according to its color, among which black opal has the highest price. In order to upgrade the lower priced white or yellow opal, some people use artificial methods to change its color and become "black opal" to make high profits. The main method is to boil with sugar or inject plastic to make the White Opal black. The identification method is that the specific gravity of opal after sugar boiling or injection molding is obviously different. When tested in water, the specific gravity becomes lighter. The heated needle can also be used to test the injection molding opal. The natural opal hot needle can not penetrate, and the injection molding opal can penetrate, and will produce the odor after the plastic is closed
identification of tourmaline
tourmaline is a medium-grade gemstone, but because peach red and bright blue tourmaline are more valuable, there are also counterfeit products. There are two kinds of common counterfeit products: one is artificial coloring with colorless tourmaline; One is made of red glass. The identification method is that true tourmaline often has obvious dichroism, and double shadows can be seen; Tubular inclusions or cotton batts can be seen in the body, and the cross section of the crystal is arc triangle. These characteristics are not possessed by counterfeit products. The workers' dyed tourmaline is not difficult to identify because of its sluggish color and lack of "Baoguang" of natural tourmaline
identification of crystals
natural crystals are clear and transparent, often contain cloud like, star like or flocculent gas-liquid inclusions, and often have microcracks. In addition, natural crystals have polarizing property, and double crystal phenomenon can be seen. For example, when a crystal sphere is seen from above, double shadows can be seen. Synthetic crystal or glass products are uniform and pure in the body, without cracks, and there are often small bubbles inside. The double shadows of the lines below the sphere can not be seen from the top to the bottom. By hand recognition, it can be felt that the proportion of synthetic crystal is greater than that of natural crystal; Natural crystal has a cold feeling, while glass has a warm feeling
identification of olivine
olivine is a green to yellow, olive like medium and low-grade gemstone. It is the most common imitation of olivine made of colored glass in the market. The main difference between the two is that olivine has obvious "double shadow", while glass does not; Crystalline inclusions are often found in olivine, and only bubbles are contained in the glass; Olivine has a specific gravity of 3.5 and a hardness of 7, which is larger than the specific gravity (2.6) and hardness (6) of glass
identification of pearls
pearls are divided into natural pearls and cultured pearls, and cultured pearls are divided into seawater pearls and freshwater pearls. The output of natural pearls is small and the price is high; The cultured pearls can be produced in large quantities, so the price is much lower. The main difference between the two is that natural pearls and cultured pearls have no nuclei. The core of natural pearls is often only some sand or parasites, or even no core. The inner core of cultured pearls is large round pearls made artificially, so the outer coating is thin. On the body surface, natural pearls have poor roundness because of their random growth environment, few foreign bodies in the nucleus roll. The inner core of cultured pearls is round, so the roundness of pearls is better. Due to the long growth time of natural pearls, the texture of pearls is fine, the bead layer is thick, the skin is smooth, there are few "convex bubbles", and it is transparent. For cultured pearls, the sound is short when they become pearls, so the pearl layer is thin, the texture is rough, the luster is "waxy", and there are often some concave and convex "bubbles" on the surface, and the transparency is poor. If it is a perforated pearl, use a magnifying glass to carefully observe the hole. If it is a cultured pearl, you can generally see a brown boundary in the Pearl, which is the boundary between the inserted core and the pearl layer grown later.
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How to identify the authenticity of jewelry due to the special value of jewelry, the most basic requirement of people is that it is genuine. Putting aside the price factor, how to ensure that people are not deceived by fake goods has become the most concerned issue and also the most worrying issue for consumers. The professional testing institutions certified by the national certification authority, with professional, authoritative and fair identification, check the quality of jewelry for consumers, and become an important basis for consumers to spend with confidence. Formal jewelry sales should be accompanied by identification certificates to clarify the quality of jewelry and ensure the right to know of consumers. Therefore, when buying jewelry, consumers must not forget to ask for the identification certificate, and carefully check whether the corresponding contents of the commodity label and the certificate are consistent, especially the number and photos. What if I worry about buying fake diamonds? Many friends are afraid of buying fake diamonds when they buy diamonds for the first time. In fact, as long as they pay attention to three factors, there is no need to worry: 1. Judge whether the business is really engaged in jewelry business. Because the reputation of this industry is very important, if you sell fake goods, you will be uniformly isolated, so the gains outweigh the losses, and generally there will be no fake goods. However, we should be careful of two kinds of stores: one is the shops in tourist attractions, and the other is the women's shops mainly engaged in various small ornaments. If these two shops claim to have real diamonds and real Jadeites, be careful! 2. There is no need to worry about buying synthetic diamonds. Here I can definitely tell you: don't worry, you can't buy synthetic diamonds! Because synthetic diamonds are more expensive than natural diamonds. The synthetic diamond mentioned here only refers to the compound with the same molecular shape. If it is polished into 57 or 58 standard faces, the cost will be higher. Synthetic diamonds were first developed by Japan in 1955, but they were not mass produced. Because synthetic diamonds are more expensive than natural diamonds, synthetic diamonds are rare in the market. 3. There is no need to worry about buying fake diamonds and other cheap gems, such as colorless gems, colorless spinels, zircon, strontium thorium, yttrium aluminum matte, yttrium gallium garnet, etc. To solve this problem is actually very simple: trust our appraisal institution! As long as we can issue the appraisal certificate of an appraisal institution with certain qualifications, we think there is generally no need to worry. Scientific maintenance of diamonds 1. Diamonds should be stored separately. Do not put it together with other ornaments to avoid damaging the essence of diamonds by friction or oxidation. It's better to buy a few small boxes containing diamond ornaments and collect them separately. 2. It is absolutely necessary to wear diamond ornaments after putting on makeup and spraying perfume. Because diamonds have oil absorption, grease or dust will stick to the surface of diamonds and make them dull. It is recommended that you soak it with alkaline detergent and water for 1-3 minutes, and then rinse it with clean water. 3. Try to pay attention to whether the diamond ornaments on your body are torn off when you wear sweaters or knitted clothes. After all, diamonds are not cheap. Cleaning of diamonds like other objects, diamonds can be smoked, stained or stained with dust. All kinds of solvents, powders, soaps and even oils produced by human body will form films on the surface of diamonds, reducing the luster of diamonds. In addition, air may oxidize or discolor jewelry. The following recommended cleaning methods for diamonds are as follows: 1. Rinse with detergent. First, pour a little detergent into the bowl and stir it with warm water to form foam. Then, put the diamonds into the bowl and gently wipe them with a soft brush. After brushing, take out the diamonds and put them into a metal mesh or tea filter. Rinse them with warm water and dry them with a soft cloth. 2. Soak in cold water: dissolve the detergent in cold water at the ratio of 1:4, and put the diamond ring into the solution for several minutes. Take it out and gently wipe it with a soft brush, then rinse it with solution once, and then wipe it dry with a paper towel. 3. Cold water immersion method: add the same amount of water to half a cup of family amonia water, immerse the diamond in the solution, gently stir, and then use paper to absorb the water. In addition, the use of ultrasonic cleaners and other special jewelry cleaners is also good.