Please ask the Great God to identify whether this black pearl is true or not. Let's introduce the refractive index to you respectively: it is the main basis for identifying gems, and pearls are round, so it is a spot test. The refractive index of pearls is 1.53~ 1.68. This is no problem. Absorption spectrum: this mainly depends on the optical characteristics of gemstones. Many gems have specific absorption spectra. Once the absorption spectrum is determined, it can basically be measured. Pearls have no absorption spectrum. Magnification inspection: concentric radial structure, which is a typical structure of pearls. The above can be confirmed as pearls. No problem. Besides, dyed pearls will be marked on the certificate. The word "dye" will be written in the remarks column. No, no problem. The dyeing of pearls is generally to soak pearls in silver nitrate solution with dyes and dry them in the sun. Let me tell you a simple identification method: natural pearls have a smooth surface, while dyed pearls are soaked, so there are wrinkles and unnatural spots on the surface, and the luster is very different from natural pearls. As long as there is formal proof, the problem is not big. I studied jewelry appraisal. You can ask me if you don't understand. I hope my answer is helpful to you.

Please ask the great god to identify it. Are these shoes high imitation or real? To identify shoes, you need to send a picture to judge the front of the shoe logo. High-definition shoes, insoles under insoles, and side logo of shoe boxes. All pictures are recommended to be taken in high definition, which is convenient for identifying the above positions.

Ask the great god to identify this Nike logo, is it true or not? Friend, there is no picture in the question, please pass it again!

I found a tutorial for you to learn. Nike shoes mainly look at:

1) Nike's logo is very sleek, and many fake logos will be printed with rough deformation;

2) Pay attention to the alignment of letters and letters, and the alignment of letters and numbers in each part;

3) Pay attention to the format of the barcode. There are only two kinds of real labels: thick line and thin line;

In the size column, the letters of US, UK, EUR and cm should be roughly equally spaced;

5) Whether the letter spacing of the website column nikebetterworld is even, and a large number of fake labels will be uneven;

6) Of course, there must be UPC codes, and the spacing between letters and numbers in a row of UPC codes should be equal.

I think it is helpful to you, and I hope it can be chosen as a satisfactory answer.

If you have any questions, you can ask me or answer them. Thanks for your encouragement and support.

Ask the great god to identify this gold inlaid jade, which is divided into gold inlaid jade and inlaid jade, but it is estimated that yours is gold inlaid jade, and the value of gold inlaid jade is not high. The quality is not high.

Buy black pearls, what color is good for black pearls, and identify black pearls. Malachite green black pearls are the best. Choose big, shiny, round, smooth and flawless pearls like a mirror.

Great gods, check whether these shoes are true or not. Rose4.5 has questions and concerns about the purchased products, and can conduct self-examination from the following details.

1. Check whether the quotation of the packing box is consistent with the real thing, including: color, style, fabric, manufacturer, etc.

2. Scan the QR code or barcode of the posted product with the scanning function of the mobile phone to see whether the physical object is consistent with the information provided by the manufacturer.

3, check the fineness of physical work, materials used in products, etc. For minimal recognition.

At present, a kind of industrial manufacturer with true standard and high imitation is popular in business circles. They often copy genuine shoes, devour the rights and interests of genuine manufacturers at a low price advantage, and make huge profits, which is invisible to ordinary people. In addition, many people love face and are greedy for cheap, which leads to many people being cheated. With the development of science and technology in today's society, don't say that this label can be imitated. Some jurists can forge RMB to the point where even the staff of the People's Bank of China can't tell the truth from the falsehood. Therefore, when buying a product, be careful not to buy it, so as not to look for regret medicine everywhere after buying it. Since I bought it, I shouldn't complain. It is not the practice of China people to be unhappy and regret.

Please help me to identify this jade bracelet by the great gods who know jade. Is it true?/You don't say. Hello!

You can't just comment on this description.

It depends on the goods

I suggest you refer to clear pictures.

Take more photos from different angles.

The great god identified the following picture to see Owen's supplementary picture to identify shoes. You need to send a picture to judge that the shoe logo is close. Take a high-definition original picture to see the shoe logo. Refers to the shoe label with information such as size in the shoe. It is recommended to choose a relatively reliable channel to buy genuine products.

Please provide the shoe label.

perhaps