How to distinguish between true and false pearls, how to distinguish between true and false pearls

First, fake pearls are generally made of two materials:

1. Made of glass balls, the surface of which is coated with a substance called guanosine, which will glow like a fish scale and shine like a rainbow.

2. The thick shell is ground, very round, and has a pearl-like luster.

Second, the characteristics of two kinds of fake pearls:

1. The "pearl" made of glass will look bright and have a regular shape. If it is a necklace, each bead is good and the size will be the same. If you look closely, you will find that its color is dead, not as unpredictable as a real pearl. If you feel it, you will find these "pearls" a little greasy and not as refreshing as real pearls.

Grind shells

Pearls are also round, regular in shape, not too small in size, and have the luster of pearls, which can be said to be difficult for ordinary people to distinguish. But if you carefully observe its luster, you will find that the light it emits is parallel stripes from any angle. This is because the structure of shells is parallel, while the cross-sectional structure of pearls is concentric.

Third, the identification method:

Real pearls are very natural and round in color. Its luster comes from the inside and looks crystal clear. Careful observation of its surface, we will find that its luster is layered, and sometimes there are rings. Natural pearls generally have some tiny flaws more or less, and they are flawless, because perfect pearls are so rare.

1. With the naked eye, pearls have natural colorful light, and in a necklace, the size and shape will be different.

Touch it with your hands to see if it is greasy or clear. Is it warm or cold? Pearl hands feel cool.

3. bite with your mouth. If you don't recognize it again, bite it with your mouth. Really, pearls feel like sand, but you can't bite the glass ball.

4. When the pearl rubs on the glass, the real pearl has pearl powder stripes and the fake pearl has no stripes.

5. Real pearls gently scrape pearl powder with a knife. Imitation pearls only scrape off a layer of skin.

6. Never believe that someone sells you very good pearls at a very cheap price. Nobody likes to lose money.

Here are the ways to distinguish pearls:

1, vision: the pearl is irregular in shape, showing translucent natural and unique five-color fluorescent luster such as jade white, yellow white, light blue and meat red; Most of the fake beads are glass imitations, with regular shapes and the same size. Generally, the surface of beads is coated with "polishing solution" made of silver powder or fish scales, which is monotonous in color and lacks halo.

2, friction: two pearls gently rub each other, there will be a sense of roughness, while fake pearls have a sense of sliding.

3. Drilling: Observe whether the drilling is clear, and there is pigment accumulation in the drilling of false beads.

4, cold feeling: pearls have a cold feeling on their hands, and fake beads do not.

5, real pearls are scraped with a knife, there will be white powder!

6. The fake pearls are flawless and the particle size is uniform.

The simplest way, if you have already bought it, you can gently grind the beads with your teeth. {Real pearls won't do any harm} Then what feels gritty is true. If you don't buy it, you can wipe it with two beads. What feels like sand is real, and what feels like no sand is fake. First of all, visually, the surface of ordinary fakes looks like carpets and wallpaper.

Second, hold the pearl with your hand, feel the coolness, and then let go to see if there are water drops on the surface of the pearl.

Third, gently take a bite with your teeth, and then touch the powder with your hands to see if there are any traces.

Fourth, look at it with a magnifying glass and tell whether it is fresh water or seawater. Generally, fresh water has a regular halo and seawater has a radial shape.

Fifth, the price is generally determined by the size, roundness and defects of pearls.

Sixth, by the way, you can also check the authenticity of pearls for flaws. If there are no flaws, be careful. Of course.

There are also very good pearls, flawless, but expensive.

I suggest you refer to these materials. Imitation pearls refer to imitations made by people in whole or in part. Because of their strong simulation, it is easy to distinguish between true and false pearls. Therefore, it is necessary to know some simple methods to distinguish pearls from imitation pearls. Pearls are fresh and cool, but they don't feel smooth when bitten with teeth, but they feel like grinding sand. If you bite hard, the sound is crisp, there are no dented teeth marks on the surface, and the nacre has not fallen off locally. There are natural machine lines on the surface of pearls, so it can be seen that the luster color is uneven anyway. In a string of pearl necklaces, there are some differences in size, and there is a natural multicolored pearl luster. At the same time, observing the pearl hole, the pearl is sharper at the drill hole because of its hardness. Imitation beads are slippery and wet, and they bite smoothly with your teeth. When bitten hard, dented teeth marks will appear on the surface, and even the coating will fall off locally. The surface of imitation pearl is slightly convex, lacking the unique luster of pearl, and generally has good roundness. At the same time, because the imitation beads are soft, there will be depressions at the drilling site. When consumers buy pearl ornaments, they can not only master the necessary knowledge themselves, but also go to a jewelry store with a certain scale and good reputation run by professionals to buy them. [How to tell whether pearls are true or false? ]-.Pearl necklace is a high-grade ornament favored by women, which not only makes people pleasing to the eye and adds charm, but also promotes health and beauty. Hainan is a famous pearl producing area. Many Chinese and foreign tourists who come to Qionghai are willing to buy Hainan pearls as souvenirs or gifts to relatives and friends, but they are often confused because they don't know the authenticity of pearls. In order to help tourists buy pearls with satisfactory quality and low price, this paper introduces some basic knowledge of pearls for reference when tourists buy pearls or pearl necklaces. Pearls are divided into two categories: wild pearls and cultured pearls. At present, most pearls sold in the market are cultured pearls. Artificial culture of pearls is to artificially insert mature shellfish, such as white butterfly, black butterfly or Pinctada martensii, and then cultivate them in seawater for about one year, so that they can form pearl lines on nuts in the natural ecological environment according to the biological characteristics of shellfish. Artificial farming is hard, smooth and round, with sunny color. People usually divide pearls into two categories: pearls and treasures. Those weighing more than 2.5 grams are called treasures, and those weighing less than 2.5 grams are called pearls. Generally speaking, the longer the culture time, the bigger the core, the thicker the tread and the brighter the luster. The pearl produced by white butterfly shell has the best texture, and the first-class pearl still shines brightly even if it is placed in the dark or in the dark. Because pearls are deeply loved by people and have high value, some people who are confused by interests use "fishy eyes and pearls" to make profits. They take fakes seriously, shoddy them and cheat passing tourists. In order to avoid being deceived, tourists can identify pearls by the following simple methods. (l) Vision: pearls are irregular in shape and translucent, with natural and unique colorful fluorescent luster such as jade white, yellow white, light blue and flesh red; Most of the fake beads are glass imitations, with regular shapes and the same size. Generally, the surface of beads is coated with "polishing solution" made of silver powder or fish scales, which is monotonous in color and lacks halo. (2) Handfeel: Zhu Zhen is very cool, even if the weather is hot, the tentacles feel very cool; Pseudobeads are sticky and slippery to the touch when they are tentacles. If it is pure glass imitation beads, its specific gravity is greater than that of pearls. If it is wax-filled glass imitation beads, the specific gravity is only about half of that of pearls. (3) firing: the pearl is fired on a gas lighter, and the surface is intact and the luster is still the same; Black smoke will appear on the surface of the false beads after burning, which will lose its luster. (Source: Ocean World) Methods Pearl powder can play a role in health care and beauty, while fake and shoddy pearl powder can not only protect health and beauty, but will endanger the health of consumers because of the excessive total number of Escherichia coli. So, how to identify its authenticity? The introduction is as follows: high-quality pure pearl powder: the raw material is high-quality freshwater pearls, which are carefully selected and washed, produced according to the drug quality standards and passed the inspection. Texture: the powder is white, uniform in color and free of impurities. Handle: It feels delicate and smooth, and is easily absorbed by the skin. Smell: It smells slightly fishy, but there is no other peculiar smell. Fake pearl powder: Fake pearl powder is generally made by heating mussel shells with alkaline water and lime, then removing the black on the surface, crushing, sieving and packaging. Texture: take a small amount of powder with your fingers, spread it out in the sun or light and observe it carefully, and you can find obvious flash. This is mica. Color: obviously whiter than pure pearl powder. This fake pearl powder is mixed with hydrolyzed animal protein powder, and mica will stick to the stomach after long-term use. Inferior pearl powder: texture: the main raw material of this powder is the powder drilled in the process of pearl jewelry processing, mixed with talcum powder. Color: yellowish, mainly caused by high temperature and high heat during drilling. Smell: there is a burning or smelly smell when taking it. Black steel needles drill holes in pearls by heating and rotating, and the fragments of black steel needles fall into powder, which contains a large number of metal bodies. Long-term use will cause chronic poisoning. Therefore, when consumers buy pearl powder, they must go to regular big pharmacies and medical supermarkets, look for well-known brands, and must not be deceived by greed and loss.

Please accept it, thank you!

How to distinguish real pearls from fake pearls? Scrape them with a knife. There is indeed a white mill.

First, quality. In other words, pearls have different shapes and different values. The pearl with the highest status is refined round bead, which is suitable for all gold and silver ornaments, such as rings, earrings, pins and necklaces, because of its beautiful shape and wide use.

Second, the skin is shallow. Including the thickness of the skin and the degree of reflection. The higher the leather, the better, and the glittering one is the best. The sign of thin and smooth skin is that facing the smooth pearl, you can see the pupil of your eyes in the reflection.

Third, color. There are white, pink, yellow, red, purple, cyan and so on. Generally speaking, white is slightly pink, commonly known as "drunken beauty"; Extremely white pearls are also precious, called "Xinguang pearls".

Fourth, size. Better be the big one. As the saying goes, "Seven-point pearls are eight-point treasures", which means that seven-point pearls are called pearls, and eight-point pearls become treasure pearls. Because the strength is hard-won, the value can be multiplied.

How to distinguish real pearl powder from fake pearl powder is a pearl formed by bivalves such as Pinctada martensii, Hyriopsis cumingii or Haliotis Crenata? Automatically take out, clean, grind and dry from the object. 1. Packing identification: 1. The product name, trademark, factory name, efficacy, batch number, specification and approval number of drug supervision department are printed on the special carton for packaging. 2. The product has instructions, which reflect the performance and efficacy of pearl powder, guide the method and dosage of medication, and the instructions are legible. 3. Loading standard: 0.3 g ((8% 3 g) (4% 6 g ((3% 2) Identification: 1. This product is white powder. Take a small amount and put it in the palm of your hand for grinding and smelling. The taste is light, and there is no feeling of ups and downs. 2. Dry loosely, without caking, take a small amount on the glass plate, and press its surface in a bright place with a stick for observation. Same batch color, no pattern, no stain. 3. The fineness of the powder is high, and there is no graininess when it is ground with fingers or tasted with tongue. Iii. Identification of counterfeit products: 1. To identify counterfeit pearl powder products, first look at the color. If the color of the same batch number is inconsistent, it may be counterfeit. 2. smell the smell. If it smells bad, fishy or earthy, it is made of inferior pearls and should be counterfeit. 3. Pearl powder mixed with oyster shell powder or fake pearl powder mixed with oyster shell powder (mother-of-pearl powder) is difficult to identify with naked eyes, and can only be identified by observation under a high-power microscope.

Buy a pearl and break it yourself. You know everything better than selling pearl powder.

How to distinguish genuine pearl powder from fake pearl powder? Method for distinguish genuine pearl powder from fake pearl pow

1, smell

The real pearl powder has a faint taste, which is the natural taste of pearls, not the disgusting kind; Generally speaking, the smell of superfine pearl powder will be heavier than that of ordinary pearl powder; The smell of nano pearl powder is heavier than that of ultra-fine pearl powder.

Step 2 taste

Real pearl powder tastes slightly salty, while nano pearl powder is a bit like sugar-free milk. The taste is mellow and comfortable, and most of the shell powder is a little astringent. Inferior pearl powder has sour, astringent, pungent or other peculiar smell, or no taste. If the powder smells burnt or burnt, and the color of the powder turns yellow, it may be the residual powder of the pearl diamond, and the yellowing of the powder is caused by the high-speed rotation and heating of the black steel needle. Long-term use of this pearl powder may lead to heavy metal accumulation poisoning.

Step 3 color

The real pearl powder color is white-like, that is, close to white. The colors of pearl powder from different processes will be somewhat different, some are slightly gray and some are slightly yellow, but they are definitely not that pale color or brown, and should be very soft;

4. Price

Basically, no real pearl powder is sold in bags of100g, 200g or even 400g. A few dollars a bag, the real pearl powder is not so cheap; The production cost of high-quality pearl powder: high-quality medicinal pearl is about 100 yuan /kg, plus packaging, equipment depreciation, management expenses, logistics expenses, etc. Therefore, high-quality medicinal pearl powder must be greater than 100 yuan. Of course, it doesn't mean that pearl powder above 100 yuan is of high quality.

5. Asset liquidity

Fake pearl powder is made by roughly crushing shells. It's thick and heavy to hold in your hand. Looking under the lamp, you can find the flash, which is very fluid (pearl powder fine enough will become a piece when pinched and spread like sand). Identification method: Pearl powder on the market is mostly bagged. Try to pinch the bag when you buy it. If the powder quickly gets out of the way (flows) and stays away from the place where you put pressure, then even pearl powder is extremely thick. If the parts you press are not so easy to spread out, or even will not spread out, but gather into a tight ball, it means that this pearl powder is very fine.

6. Relevant certificates

Pharmaceutical pearl powder manufacturers with the quasi-brand name of National Medicine should pass GMP certification, otherwise the safety of products cannot be guaranteed. Manufacturers of high-quality pearl powder will pay great attention to every detail of their products, such as packaging, Chinese and English characters and even punctuation marks. The requirements for printing quality and packaging quality are very strict, the color will not be black, overprinting will not be inaccurate, and sealing will not be incorrect.

How to tell real pearls from fake pearls that will turn yellow if worn for a long time? As the saying goes, "old pearls are yellow" is the truth. False pearls don't turn yellow.

Specifically, the identification methods and common sense of pearls are as follows:

(1) Natural pearls Natural pearls are formed by mother-of-pearl deposited in mollusks such as pearl mussels and around certain substances. When foreign matter enters the pearl mussel and contacts with the mantle channel, perlite is wrapped layer by layer to form pearls. The nacre is mainly composed of concentric growth layers of horny and aragonite crystals, so the pearl is a radial sphere composed of two substances. When light shines on nacre, due to the different refractive indexes of overlapping horniness and aragonite, the reflected light waves will overlap each other, resulting in the interference effect of light and the unique soft and iridescent pearl luster of pearls.

② Pearl culture began in China. The largest producer of cultured pearls is Japanese, followed by China. Cultured pearls are divided into seawater cultured pearls and freshwater cultured pearls. Seawater pearl culture adopts the method of nucleated pearl culture. The method is to cut a groove on the touching foot of the mother clam, put a small pearl made of mother-of-pearl and a piece of fabric wrapped with beads, secrete nacre from the mother clam, and wrap the mother-of-pearl to form a round pearl. Hydroponic pearls can be divided into nucleated pearls and seedless pearls. Nuclear pearl culture is the same as seawater pearl culture. Freshwater seedless pearl culture was initiated by the Japanese and called Biwahu Pearl. The method is to take out the mantle of a small piece of pearl mussel, cut it into a 5mm square membrane, and put it into the mantle of the mother pearl. The membrane will survive in the tissue fluid of the mother pearl. When the diaphragm and mantle of the mother mussel grow together, a seamless pearl sac is formed, and the mother-of-pearl secreted by the mother mussel gradually grows in the sac. The pearl center made of seedless pearls is empty, and a mother oyster can produce dozens of pearls. The main difference between freshwater pearl culture and seawater pearl culture is that each mussel can produce many pearls in fresh water, and there is no solid.

(3) There are three kinds of pearl imitations sold in the pearl imitation market: wax-filled glass, solid glass and plastic-coated imitation beads. These imitations can produce pearl-like luster when soaked in "oriental perfume", which is usually a suspension of guanine in nitrocellulose. Using this method, the imitation is very similar to the natural pearl in appearance. 3. Instrumental identification of natural pearls and cultured pearls It is difficult to distinguish natural pearls from cultured pearls. Their appearance characteristics are basically similar, so it is difficult to distinguish them with naked eyes and it is complicated to identify them with instruments. At present, there are specific gravity method, cone hole method, endoscope method, X-ray photography method and X-ray fluorescence combination method. And it is difficult to determine by only one method, in which X-ray photography and X-ray fluorescence combined method are conclusive tests, but the identification cost is too high. Pearls purchased by individuals are generally not identified in this way. Here are some convincing ways to distinguish natural pearls from cultured pearls.

① Endoscopy can be divided into single-mirror method and double-mirror method, but the serious disadvantage is that the beads to be identified must be punctured separately to be detected. The single speculum method uses a strong light source to directly irradiate the pearl from one side to inspect the wall of the perforated pearl. The light is reflected to the mirror through the pearl wall and then to the focusing microscope. If it is a natural pearl, the observer can see concentric circles layer by layer until the center of the pearl, and the brightness of the light will gradually weaken; For cultured pearls, concentric circles seem to start suddenly from the mother-of-pearl nucleus, and the brightness decreases rapidly. The double mirror method uses a hollow needle, and the two mirror surfaces form an angle of 45 degrees with the extension direction of the needle and 90 degrees with each other. Careful use of this method is almost 100% effective. The specific method is as follows: the hollow needle is installed in front of a strong light source, so that the light directly passes through the hollow needle to reach the first mirror surface, and the light is reflected to the wall of the perforated pearl through this mirror surface. If pearls are cultured artificially, light will travel along many parallel layers until it penetrates the thin shell of mother-of-pearl; If it is a natural pearl, the light directly passes through the perforated pearl, directly shines on the second mirror and reflects into the microscope. This is because in natural pearls, when light is projected on the wall of a perforated pearl, the light propagates around the pearl in a concentric circle of mother-of-pearl, and the light originally projected on the wall is totally reflected.

②x-ray Diffraction Method When natural pearls are irradiated with X-rays, the diffraction pattern produced at any position is six times symmetrical, and hexagonal pattern spots appear. Only in one diffraction position can cultured pearls produce a sixth-order symmetry diagram. At this position, if the pearl is rotated by 90 degrees, it will produce a quartic symmetry diagram. The disadvantage of this method is that cultured pearls with large mother-of-pearl thickness may also produce hexagonal patterns in most directions, which can not be distinguished from natural pearls when testing cultured pearls in seedless fresh water.

③X-ray photography The whole string of pearls can be determined by identifying pearls through X-ray photography. In natural pearls, the absorption of X-rays depends on the thickness of mother-of-pearl, because it is a homogeneous object. The X-ray photos of natural pearls obtained by X-ray transmission will show several subtle levels, but the boundary between pearl nucleus and mother-of-pearl of cultured pearls is very obvious, because the shell matrix layer near mother-of-pearl nucleus has good transparency. If freshwater cultured pearls do not have a solid core, black worm-like spots often appear near the center.

④ Fluorescence method is often combined with X-ray method, and the conclusion is the most accurate when they are combined. Under X-ray, all cultured pearls will emit fluorescence. But among natural pearls, only freshwater natural pearls and some Australian natural pearls will emit fluorescence. The results of this fluorescence test, combined with the information provided by careful study of X-ray photos, can accurately identify beads and similar single pearls.

4. The difference between natural pearls and cultured pearls Natural pearls are delicate in texture, soft in luster and high in transparency (mostly translucent). Cultured pearls are loose in texture and have "small bags" on the surface, commonly known as "prickly heat bag" or "pull". The difference between seawater pearls and freshwater pearls is that seawater pearls are of good quality and are mostly translucent; Freshwater pearls are often white and gray, and their luster is not soft.

5. Identification of dyed pearls and pearl imitations. There is generally no need to change the color of pearls, but if you see rare gray-black and black pearls, you should be vigilant. Because it may be dyed. At present, the known dyeing method is to soak pearls in silver nitrate solution, take them out and dry them in strong light to turn them black. The difference is that natural black pearls are not pure black, but dark blue black with rainbow-like flash, or black with bronze hue; The dyed pearls are uniform in color and poor in luster, showing gray-black and black. If pearls are scrubbed with a cloth dipped in dilute nitric acid with a concentration of 1.5%, there will be black marks on the cloth. The difference between three common pearl imitations: wax-filled glass imitation beads are filled with paraffin in hollow round ivory glass balls. The density of this kind of imitation beads is low, generally lower than 1.5Cg/cm3, which can be distinguished by hand. Use a fine needle to detect that the inside of the ball has a soft feeling, and the outer needle can't be engraved, and the surface is smooth. Solid glass imitation beads are made by soaking ivory solid glass balls in "real beads". When observed with a magnifying glass 0/5 times that of/kloc-at the borehole, only a thin layer of "Zhu Zhen * * *" can be seen, which will fall off in pieces when touched with a needle, and no fine scaly powder is found. Plastic-coated imitation beads are a thin layer of "real beads * * *" wrapped around milky white plastic beads. Observing with a magnifying glass, the surface of the coating is uniformly distributed in the form of papules, which is not as firm and flat as natural pearls or cultured pearls. Stir with a needle, there will be fragments falling off and no fine powder can be found. In addition to naked eye observation, the other distinguishing feature of the above fakes is that they are insoluble in hydrochloric acid.

How to distinguish the authenticity of pearl powder: generally speaking, the best pearl powder is delicate in texture and light in taste; Inferior pearl powder is the kind with strong smell and bad smell. Specifically, the real high-quality pearl powder raw material is high-quality freshwater pearls. Texture: the powder is white, uniform in color and free of impurities; Hand feeling: it feels delicate and smooth, and is easily absorbed by the skin; Smell: It smells slightly fishy, but there is no other peculiar smell. Pearl powder can be put into pure water. Good pearl powder won't sink at all, but it will fog a lot, and the dust that sinks at the bottom of the cup is like smoke. Inferior pearl powder is not like this. The main raw material of this powder is the powder drilled in the process of pearl jewelry processing, mixed with talcum powder. The yellow color is mainly caused by high temperature and high heat when drilling; When taken, it tastes burnt or smelly; Long-term use will cause chronic poisoning. Fake pearl powder can be dipped in a small amount of powder with your fingers. Careful observation in the sun or light, there will be obvious mica, the color is obviously whiter than pure pearl powder. Long-term use is extremely harmful to the gastrointestinal tract. Simply put, the mesh number of pearl powder refers to the fineness of pearl powder. The larger the mesh number, the finer the grinding. Traditional pearl powder is made with traditional tools such as sieve. Traditional pearl powder is made by washing pearls, wrapping them in cloth, boiling them for about two hours, taking them out, exposing them to the sun 1 ~ 2 times at night, grinding them into fine powder and drying them in the sun for later use. This pearl powder can form a suspension when poured into water, and can be dissolved in gastric acid, which not only keeps all the ingredients of pearl powder effective, but also improves the absorption rate of pearl powder. At present, a large part of pearl powder on the market is made of pearl mussel shells, and the price, quality and authenticity are quite different.