Official website: As a collector, it is very useful to know the identification method if you want to find your favorite jewelry in the collection market. However, there are many kinds of jewelry on the market, and knowing that one identification method may not be applicable to other kinds of jewelry, it is undoubtedly beneficial for collectors to learn some common identification methods. Next, I will introduce several common identification methods to you, hoping to help you. I. Identification of Ruby 1. Natural gemstones have "ten Hong Jiu cracks", and natural rubies without any flaws and cracks are extremely rare.

Artificial rubies have the same color, few internal defects or crystal inclusions, and are clean and large. As a precious gem, natural rubies over 3 carats are very rare in the market. If you encounter a big ruby, official website: Stone, you should pay attention, because the value of natural ruby is thousands of times higher than that of artificial ruby. A little carelessness will "take medicine."

2. Natural ruby has a strong "dichroism". The so-called dichroism means that two colors, red and orange, appear from different directions. If there is only one color, it may be red spinel, garnet or red glass.

3. Red spinel and natural ruby are very similar, and they are most easily confused, so be very careful.

Second, the identification of diamonds diamonds is the hardest substance in natural substances. A diamond can carve any other gem, but no other gem can carve a diamond. You can also use the "standard hardness tester" to score, and any hardness below 9 degrees is a fake diamond. Diamonds are also lipophilic. If you draw a line on the surface of a diamond with a pen, it will become a continuous straight line, while other gems will break intermittently. The above methods have certain reference value for identifying diamonds. You can also observe it through a magnifying glass with a magnification of 10. Under the magnifying glass of 10 times, most diamonds can see defects, such as triangular growth lines, and the diamond surface has "red, orange and blue" fire light. Radiant.

The most accurate and reliable method is to measure the thermal conductivity data with a "thermal conductivity meter" to distinguish between genuine and fake diamonds, but the "thermal conductivity meter" is expensive.

Third, the identification of sapphire The color of natural sapphire is often uneven, and most of them have a flat growth line. Artificial sapphires are of the same color, and their growth lines are arc-shaped strips, and they are often breadcrumb-shaped or beaded bubbles in the body. Official website: Four. Identification of Emerald The difference between emeralds and similar natural green gems, synthetic emeralds and fakes. Similar natural green gems include fluorite, green tourmaline, apatite, jadeite, green sapphire and garnet containing chromium, vanadium, calcium and aluminum; Artificial emeralds and imitations include synthetic emeralds, beryl, foil-lined emeralds and oiled emeralds. The differences are as follows: fluorite, blue-green, isotropic, low hardness 4, density 3. 18 g/cm 3, larger than emerald, light blue fluorescence. Green tourmaline and dark blue green tourmaline become pure green after treatment, with obvious dichroism, high birefringence, 0. 18 and high density. Apatite, light green apatite, with blue hue, small hardness of 5, large refractive index of 1.632- 1.667, and phosphorescence under ultraviolet light.

Emeralds, high-quality translucent emeralds are more like emeralds, but emeralds have a fiber interwoven structure with finer fibers, which emeralds do not have. In addition, garnet containing Cr, V, Ca, Al [2] is emerald green isotropic and has a strong sub-golden luster. Emerald is synthesized artificially by flux growth method and hydrothermal method, with rich colors, strong red fluorescence under ultraviolet light and bright red under color filter. There are also beryl three-layer stones, foil-lined emeralds, oil-colored emeralds, etc., which can be distinguished from emeralds after careful observation and identification.

Verb (abbreviation of verb) Identification of jadeite 1. Some people say that a piece of green jade is illuminated with Dow filter. If it turns red, it can be explained that this jade is dyed, and it is true color if it does not change color. This statement is very mechanical and is a parrot's understanding.

2.Dow filter is a color filter film, which only allows red light and orange light to pass through. The fuels used for jadeite dyeing generally contain chromium salts. When its concentration is high, it will emit red light. Under the Dow filter, official website: It will appear red. However, if the dyed color is not deep, the concentration of chromium salt is not high, and it is red under Dow 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 Dow color filter, we should carefully analyze it, which will have an indicating effect and cannot make a conclusive judgment.

Identification of intransitive verb cat's eye In recent years, there is a kind of glass fiber cat's eye ring embedded in gold or silver rings, which makes it impossible to distinguish between true and false. The identification method is that when the torus is rotated, several light bands can appear at the arc top of the fake cat's eye at the same time, while there is only one real cat's eye. The fake cat's eye line is rigid, while the real cat's eye line is flexible. True cat's eyes are mostly brownish yellow or light green, while fake cat's eyes are varied in color, such as red, blue and green.

Golden emeralds are second only to diamonds and red sapphires in hardness. Golden emeralds and various metamorphic rocks and opals are not only very beautiful, but also very expensive, because they are extremely rare. Opal is a color-changing effect of emeralds with developed vacuum inclusions after cutting by Kapson.

The above is my brief introduction. For more information, you can call the official number of Qianbaiyi Culture and Art Exhibition Co., Ltd., log in to official website and follow its official WeChat account. I will reply to you as soon as I see the news.

Shenzhen Qianbaiyi Culture and Art Exhibition Co., Ltd. Corporate Culture is a comprehensive company integrating art selection, appraisal, exhibition and trading services. Official website: Our company adheres to the principles of fairness, justice and openness, and builds a brand-new, safest and most reliable trading platform for our customers based on honesty, trustworthiness and * * *.

Based on today, Shenzhen Qianbaiyi Culture and Art Exhibition Co., Ltd. will give full play to its unique advantages and serve the society with profound professional knowledge, full work enthusiasm, rich operating experience and huge customer resources. Really realize the grand dream of starting the globalization of folk art trade on the basis of orderly international art resources.

Selection: porcelain, jade jade, calligraphy and painting, rare books of ancient books, purple sand, coins, stamps, jewelry ornaments, bamboo and wood tooth carvings, bronzes, ancient furniture, miscellaneous pieces, red collections and other ancient and modern works of art.

Corporate culture of Shenzhen Qianbaiyi Culture and Art Exhibition Co., Ltd.: Based on the orderly inheritance of culture and art, improve the public platform for art trading and help domestic friends realize their ambitions of investment and collection.

Domestic authoritative jewelry appraisal _ jewelry appraisal certificate will not be read? Look at this and you will know that the certificate is useless? Many people think that the key to buying gems is eyesight, and certificates are actually useless. But in fact, unless you are a real gemmologist or an "expert" with long-term experience in buying gems on a large scale, your vision will always be limited.

It will be beneficial and harmless if the seller can be asked to provide a certificate containing important reference information of the gem when purchasing.

The information that has a great influence on the value of gemstones includes color, clarity, weight, size, cutting, optimization, origin and so on. The openness of this information depends on the jeweler's operating principles, and can also reflect a jeweler's integrity and professionalism from one side. In addition, it is very necessary to obtain the appraisal certificate of an authoritative laboratory for your important gems when the inspection conditions permit and it is economical. Of course, the institution issuing the certificate should be authoritative, and not all the testing certificates of any testing institution are credible.

How to make effective use of certificates For consumers who don't have professional gemstone knowledge, appraisal certificates are an important factor in determining purchase behavior and maintaining consumer confidence.

When you get the appraisal certificate from colored gems, you should confirm, understand and effectively use the certificate from the following aspects: A. Inspection organization: There are three signs here: CMA, ILAC MRA and CNAS. Let's talk about these three authoritative organizations first: "CMA" is the English abbreviation of China Metrology Certification.

It is a comprehensive certification and evaluation of the testing ability and reliability of testing institutions by the metrological administrative department of the people's government at or above the provincial level according to the provisions of the People's Republic of China (PRC) Metrology Law and the National Metrology Law.

This symbol only indicates that the organization is a unit that has passed the measurement certification review and is a necessary qualification for any unit that issues a jewelry appraisal certificate. The inspection report marked "CMA" can be used for product quality evaluation, results and judicial appraisal, and has legal effect.

ILAC-the abbreviation of international laboratory accreditation cooperation. International Laboratory Accreditation Cooperation (ILAC) was established in 1996. Its purpose is to establish international cooperation and promote international trade by improving the acceptance of test and calibration results released by accredited laboratories. Its charter is to establish a network of mutual recognition agreements between recognized institutions to achieve this goal.

CNAL signed the Multilateral Mutual Recognition Agreement "ILAC-MRA" with international laboratory accreditation cooperation (ILAC) on 2001/. On June 5438+ 10, 2005, it was approved by AC to use the ILAC-MRA international mutual recognition mark, which indicates that CNAL and ILAC-MRA marks can be used by testing laboratories accredited by CNAL.

CNAS- China National Accreditation Committee for Conformity Assessment (CNAS) is a national accreditation body approved and authorized by the National Certification and Accreditation Administration in accordance with the Regulations of People's Republic of China (PRC) on Certification and Accreditation, and is responsible for the accreditation of certification bodies, laboratories and inspection institutions. China National Accreditation Committee for Conformity Assessment was formally established on March 3, 2006. It was formed by the integration of the former China National Accreditation Committee for Certification Bodies (CNAB) and the former China National Accreditation Committee for Laboratories (CNAL).

B inspection standard: the inspection standards here are: GB/T 16552, GB/T 16553, GB/T 16554, GB1887, and the following are the corresponding meanings of each standard:

The authority where the test is located will be displayed here, and the touch will have obvious concave and convex feeling (a little bit can also be seen in the figure).

D. Coding: Here is the coding and verification code (I mosaic the coding information, leaving some suspense). Coding is very important. According to the code and verification code of the certificate, you can check the authenticity of the certificate and whether there is information about the certificate and its contents in the jewelry appraisal official website. If the query content does not correspond or the code is wrong and the login fails, it can basically prove that the certificate is forged. Here, you can look at the contents of the certificate found on the official website. As shown below, the contents of official website's inquiry are consistent with the contents of the certificate: e. Appraisal result: the authoritative department prints the appraisal conclusion on the appraisal book according to the appraisal standard.

F. Appraiser and person in charge: There will be the autographs of the appraiser and person in charge here to prove the importance of being responsible for the appraisal results.

Domestic authoritative jewelry appraisal _ ranking of authoritative appraisal institutions of international gem laboratories The authoritative appraisal institutions of international gem laboratories are ranked as Class I: they are recognized in important international diamond trading centers and key markets, with high authority and liquidity, and can detect most processed and synthetic gems.

According to regional influence and mobility, it can be divided into Class A and Class B: Class A: GIA International Gemological Institute, GIA- American Gemological Institute, HRD-Hogeraad Voor Diamond (Belgian Diamond High Council), SSEF- Swiss Gemological Institute (Swiss Gemological Institute) and GAAJ- Gemological Association. All Japan (All Japan Gemological Association) Class B: AGS-American Gemological Association, ICA-International colored gems Association, AGTA-American Gem Trade Association, CIS——GISGEM S.p.A Laboratory, SADL-South African Diamond Laboratory, DIA-International Diamond Certification Laboratory EGL-European Gemological Laboratory, and IDI-Israeli Diamond. Ngil-Israel National Gemological Institute, GII-India Gemological Institute, WGI-World Gemological Institute, DGEM G-German Gemological Logic Association, GRS-Gemological Research Laboratory (Swiss Gemological Research Laboratory) IDL-International Diamond &; British Gemstone Testing Laboratories (British Gemstone Association and Gemstone Testing Laboratories) DFHK- Hong Kong Diamond Federation (Class II): Small-scale laboratories in non-key markets, and new gem processing and synthesis technologies are difficult to detect. Usually its recognition is limited to one country or several countries. According to liquidity, it can be divided into class A and class B, and some non-independent third parties also participate in the transaction.

Class II and Class A: Association of Gemologists accredited by AGA, DCLA- Australian Diamond Certification Laboratory, DGLA- American Diamond and Gemstone Laboratory, CGL- (Japanese Central Gemstone Laboratory), HKD-HKD Diamond Laboratory, Canadian Adgl- Australian Diamond Classification Laboratory, NGTC- National Gemstone Testing Center (China National Gemstone Quality Supervision and Inspection Center), Aigs Asia Gemological Science Research Institute, git- Thailand Gemstone and Gemstone. CcedilAis de Gemmologie (France), Grade B: gem Lab- Liechtenstein Gem Laboratory (Liechtenstein Gem Laboratory), Grade Gem Certification and Assurance Laboratory, igli- International Gem Laboratory and Research Institute, Nagl- North American Gem Laboratory, Jggl- Japanese Gem Laboratory gems can- American Gem Laboratory (GS Laboratory), igli Pacific Gem Laboratory (Pacific Gem Laboratory), IBGM-Instituto Brasileiro de Gemas e Metalis Preciosos (Brazilian Gemstone and Precious Metals Laboratory) and NGL- Dutch Gemstone Laboratory (Netherlands