Mineral Review

How to distinguish a real natural coil stone from a fake?

Dear Amethyst, somewhere around 2007, I grew up from China. the market receives products from the so-called. “pressed coil”. Some “coils” are very similar in design to natural ones. I asked gemologists how to distinguish these stones, except for their appearance, but no one answered. These stones are not subject to examination because they are cheap. You, as always, are the last resort) In the photo on the left – imitation and natural stones, on the right – inexpensive beads from “serpentine”, which are littered with wholesale warehouses of jewelry from China. What are they made of and are there ways to determine authenticity other than visually? Thank you for your reply. Amethysts, 22.09.2017 Let’s admit it, Lika, we. at a dead end. If you showed us the beads, we would doubt that it was a coil. But we would not be able to distinguish the two pendants in the form of cabochons. The first thing that comes to mind is to measure the refractive index (RI). But the PP of a natural coil varies widely: from 1.47 to 1.57 – so this range of values ​​covers many ceramics, glasses and even. plastics with the addition of stone dust chips. So this method can be used ONLY IF FOR A CHINESE PRESSED COIL the PP is quite specific and does not change from fake to fake. Then at least somehow you can “rely” on this meaning. Second consideration. Try to look at the “green” part of the stone, free from blackness, in natural and pressed (more likely sintered, judging by the same grain sizes) using a x10 magnifying glass. The coil is ENTIRELY fiber. What is the structure of a fake? It would be nice for us to get one bead and one cabochon, as shown in your photo on the left, that is, those same fakes. We have many different varieties of coils. And Asbestovsky and Shabrovsky and Subpolar-Ural. But these are all natural stones and in raw materials – blocks. We understand that we didn’t help much, if at all. But we are interested, and we hope to return to this issue soon. Moreover, we are not indifferent to immigrants from the Middle Kingdom and their “creations” with which they quickly flood foreign markets. With respect and gratitude for raising the question. Lika, 24.09.2017 Dear Amethyst, thank you for your quick response. The photos are not mine, but of participants in one of the groups teaching stones for beginners. For some reason, lately there has been an increased interest in coils, and people want to know what they are buying. There are many coils in nature, the stone is inexpensive, buying a decoration or souvenir is not a problem. Everything would be fine, but on some websites sellers write “pressed coil”, or “imitation coil”, and it is really difficult to distinguish these products from natural ones. Here is a photo from sites that indicate “imitation coil”. Lika, 24.09.2017 And these products are varnished and the inscriptions on the tags are as follows: 1. “Snake” bracelet (imitation), varnished. 2. Lacquered beads, natural serpentine. The bracelet is signed “imitation”, and looks more like a natural one than beads. Why do manufacturers increase the cost of production and coat the product with varnish? There are two answers. Firstly, in order to reveal the color, make it more saturated (stones are brighter when wet and varnished), then why don’t they varnish natural rhodonite? And secondly, maybe unvarnished stones leave marks on the body, like painted coral and lapis lazuli, then why aren’t they varnished? And the third, almost incredible. Manufacturers take care that the stones do not lose their appearance in the future (due to their softness). Lika, 24.09.2017 Stones in beads and bracelets differ in design from serpentine in souvenirs. The stone pattern in crafts is not as ordered as in beads and bracelets, and is more “deep”. Lika, 24.09.2017 Dear Amethyst, I, like you, am at a dead end. Under 10x magnification, the imitation coils (beads costing 2 dollars and a bracelet costing 1.5 dollars) also have a faint semblance of scales!) It was not possible to take a photo in focus on the phone. Unfortunately, I won’t be able to send you a bead; I’m in another country that has restricted mail with Russia. Maybe we’ll stop at the fact that those who want to buy a natural coil should choose stones with a disordered pattern, as in photos 1-3 (buy coils from the Ural craftsmen, and not from China), and avoid a pattern that resembles a mesh or fracture, as in Fig. . 4-7? Thank you again for your participation and sorry for the quality of some of the pictures. Amethysts, 24.09.2017 I’ll come and visit Gemma. I will buy samples and continue to discuss the research results. Thanks again for raising the topic. = Post Scriptum. That is why stones are coated with epoxy varnish for increased wear resistance, we know for sure. The coil is polished flat by tumbling. And polishing each ball by hand is an unaffordable luxury. So, straight from the large ball grinding machines, on which the cubes take the form of balls, the beads immediately go to varnishing. As a result, they shine like polished. The varnish is applied by spraying. = Lika, 24.09.2017 Thank you, dear Amethyst. We are waiting for your thoughts. If not you, then who? And there is no one else. There was another authority, Mark Vishnevetsky, but he left us, a big loss for everyone. Of the professionals who competently and willingly answer questions, you are the only one left. Best regards and see you in touch! Amethysts, 24.09.2017 Thank you, of course, but there are a lot of qualified people on the domestic market. And there are even more people who are not indifferent. I know many of them personally, but I don’t want to embarrass them. I also started to experience the alexandrite effect – I turned red. = Irina, 10.01.2020 Hello! I found this site completely by accident and couldn’t tear myself away from this discussion! The fact is that in the “bowels” of the old dacha, a shell (stand) from a table lamp from the 80s of the 20th century was discovered. I wanted to throw it away. There is a GOST tag left on the bottom, which means the lamp was made in the USSR. The stone parts of this stand are very large, heavy, about 1 kg. It looks like serpentinite. But doubts still creep in. So I think there were fakes in those days? The color of the stone is less bright than in the photo. Has some yellowish-golden inclusions. What do you think? Maybe you can give me some advice on where to go to establish naturalness? Amethysts, 10.01.2020 1 – It was necessary to create a new topic. 2 – Hands are not allowed in photographs. Didn’t read the rules. 3 – Removed two out-of-focus photos. 4 – Your coil is natural and high quality. Contained veins of opal, asbestos and translucent serpentinite – bowenite. The deposit is the city of Asbest. Asbestos coil. = Irina, 10.01.2020 Sorry, I wrote at night, I didn’t go into all the details. I took a photo of my hand so that the size was clear. Thank you very much for your answer!

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Jewelers, as well as those specialists whose occupation is associated with the production and sale of precious stones, can always determine which stone is in front of them – natural or artificial. Most often, this question arises when it comes to evaluating a stone. The cost of a stone directly depends on its purity. Each specialist has developed for himself certain rules for determining the purity of a stone.

So, for example, distinguish real diamond from a skillful forgery it is not difficult. To do this, you need to look through the stone at some light source. A natural diamond always has a point of light. It’s a matter of stone processing. Jewelers line up the edges so that when light is refracted and reflected, a single point of light is created. This is done so that when using a diamond in jewelry, the human body or metal cannot be seen through it. After all, it is the play of light of diamonds that attracts the eye. Zircons are often used to imitate diamonds. In our catalog you will find many products with zircons, and you can also buy silver wholesale from the supplier.

You can identify a fake diamond made from lead glass using a glass of glycerin or water. A natural diamond will sparkle with all its facets, and a fake will be invisible. The same can be done with a diamond. Sapphire and spinel are often used as diamond imitation. The stone must be lowered into a glass with monophthlene bromide or methylene iodide. The refractive index of these liquids is close to that of the stones used for imitation. Spinel and sapphire will be practically invisible in liquid, and the diamond will sparkle with all its facets.

If you buy aquamarine jewelry, feel the stone. It should be cold to the touch. If glass is used instead of aquamarine, the stone will be warm. If a seller offers you artificial aquamarine, do not believe him. This stone is not grown under artificial conditions. Most often, glass or spinel is used instead of aquamarine. Quartz and rock crystal are also cool to the touch.

Natural rubies contain many different inclusions. If you look at a ruby ​​with a magnifying glass, you can see grains, spots, inclusions and voids. Large, pure rubies with a uniform color are extremely rare in nature.

If your turquoise ring has changed color, do not suspect that it is fake. Turquoise can change shades depending on the situation. In ancient times it was believed that if turquoise changed color, trouble awaited. It is now known that turquoise can change color when exposed to chemicals and cosmetics. Even fat and soap can affect the color of turquoise. For turquoise, inclusions are considered acceptable. This is not a sign that the stone is fake.

It is very interesting to determine the origin of minerals that contain iron. Let’s take pomegranate as an example. This stone has a magnetic attraction force. In order to determine whether this is a natural garnet or a fake, let’s weigh the stone. After this, put the pomegranate in a cork that will not come into contact with the metal pan of the scale. Let’s balance the scales and bring a small magnet to the stone. If the pomegranate is natural, the balance will be disrupted.

Natural amber capable of being electrified. But sometimes plastic fakes are also electrified. In this case, you can resort to tough measures. Take a knife and cut the surface. Natural amber will crumble, fake plastic will produce thin shavings. If the fake is not made of polystyrene, you can test the stone by dipping it in a saturated salt solution. Take a glass of water and dilute 10 teaspoons of salt in it. Imitation will sink in such a solution, but natural amber will not. Professionals use ultraviolet light to determine the authenticity of amber. A real stone exhibits a bluish glow when illuminated by ultraviolet rays.

In order to determine the origin of the pearl, the stone is placed in a vessel with copper sulfate. The vessel is transilluminated and monitored to see how the pearls behave. Natural pearls will have a reddish tint. In our catalog you will find silver earrings with pearls, as well as pearl sets with natural stones. Natural pearls can be distinguished from fakes by examining them under a microscope. Natural pearls have a rough, uneven color surface, while fake pearls have a smooth, even surface without flaws. Imitation of pearls began in the 17th century. At that time, hollow balls of the same shape were used to create artificial pearls. These balls were covered with parchment glue. The essence obtained from the mother-of-pearl scales of bleaks was attached to this glue. In order to give the stone weight, wax was poured inside. Nowadays, celluloid, glass, alabaster, selenite and mother-of-pearl are used to imitate pearls. A ball of these materials is coated with enamel and immersed in a cellulose solution. In order to create artificial black pearls, hematite is used. Imitation pink pearls are made from coral. Cheap imitation is most often made of plastic. It is tinted and covered with mother-of-pearl.

Nowadays, the most common imitation of precious stones is rhinestones.. It contains 53.3% lead oxide, 38.2% silica and 7.8% potassium carbonate. The rhinestone received its name in honor of the German jeweler I. Straz, who created an artificial stone in the XNUMXth century. Compared to natural stones, rhinestones have low strength. But it can shimmer no worse than the original. In the old days, a file was used to recognize natural stone. But this method can damage not only the fake, but also the natural stone. Therefore, it is better to use a microscope. Natural stones usually have bubbles. Their sizes are significantly smaller than those of bubbles in rhinestones.

But nowadays, jewelers have learned to create small bubbles in rhinestones. This rhinestone is as close as possible to natural stone. You can determine the rhinestone by temperature. Glass is warmer to the touch than natural stones. In addition, spirals, fibers and funnels can be seen inside the rhinestone. The refractive index of glass is very different from that of natural stones. The single refraction of glass can be explained by the fact that artificial stone is a non-crystalline substance. In rhinestones, only one shadow angle can be seen on a refractometer.

There is a transitional stage between imitations and fakes. These are beryl glasses. The chemical and physical characteristics of synthetic stones are generally similar to those of natural stones. An analogue can be made from beryl glass that looks similar to natural stone, but with completely different chemical properties.

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