At present, diamond jewelry is increasingly loved by people, and how to easily and quickly identify the authenticity of diamond jewelry has become a matter of great concern to consumers. Diamond is the most important type of precious gemstone. Its unique nature determines that it is different from other natural and artificial diamonds. It is identified by the naked eye as follows:
First, pay attention to the luster and dispersion of gemstones
Diamonds should exhibit a typical diamond luster. According to the diamond's dispersion (0.044), the finished diamond finished product should be able to show a clear "fire", but common artificial imitation diamonds (such as cubic zirconia, barium titanate, yttrium aluminum garnet... have more Strong dispersion, showing a more obvious "fire", cutting the standard of such imitation diamonds from the crown to see the emergence of seven colored light, and the diamond "fire" is generally only blue and Orange two kinds of light.
Second, pay attention to the appearance of certain characteristics of diamonds
1. Due to the high hardness of the diamond, there should be no scratches on the surface of the diamond. The hardness of the drill is not as good as that of the diamond, so the surface often sees scratches.
2. Due to the high refractive index of the diamond (2.417) and the excellent cut, when the diamond finished table is placed face down on a text, the word will not be visible from the pavilion. This is called "reading the word"; The table is inclined to the side of the observer, and the side of the gemstone pavilion opposite to the observer's line of sight is observed from the table. The dark window that appears due to light leakage is not seen. This is called the "dark window method"; the diamond table is placed face down. Add water to the glassware to the height of the tip of the diamond, and converge the light source vertically to illuminate the bottom edge. When the container is taken away from the lower load, a radiant image can be seen on the background of the lower object. The range of light rays away from the center is not like the image of other gems. The light is intertwined with the light field. This is called “seeing the picture methodâ€.
3. Use a 10x magnifying glass to observe whether the unpolished diamond waist has original traces such as eclipse, cleavage surface and growth pattern. Most diamonds have tiny flaws under a 10x magnifying glass, which is different from the cleanliness of the diamond.
Third, pay attention to some auxiliary identification features of diamonds
Although the following characteristics are not directly available for the identification results, they can be used for prevention purposes. The main features are:
1. Pay attention to the "quantity-to-price ratio" of diamonds. The basic characteristic of diamonds is that the grain price is high. If there is a contradiction, you need to pay attention. If you buy a 400mg (2ct) diamond with 3,000 yuan, you should be suspicious.
2. Pay attention to some of the features left by the diamond processing. These features are caused by certain characteristics of the diamond and special diamond cuts, including: straight edges and sharp edges, no burrs (occasionally residual crystal face defects or collapse); facet joints are good, the tops are sharp, no Over or under the tip; the alignment of the crown and pavilion is very accurate; the reflection of the facet of the diamond pavilion from the countertop is always bright and dark. Drilling products often do not have these characteristics of diamonds, and their edges have large degrees of wear and tear. Most of the facets are not properly handed over, and the alignment of the crown and pavilion is not accurate enough.
Fourth, the drop test
This test is based on the lipophilicity of the diamond (after rubbing the surface of the diamond by hand, the diamond will look greasy and greasy). To do this: Use an oil-based pen to scribe or write on the surface of the diamond. When doing the same experiment on the surface of other gems or diamonds, the oil traces will be intermittent. Similarly, folks also have a pencil scribing method in which the diamond sample is wetted with water and then marked with a pencil on its surface. If no pencil marks are left, the sample to be tested is a diamond, otherwise it is otherwise. Gemstone variety.
Of course, accurate identification of diamonds also requires a series of sophisticated identification instruments. Here, we only introduce a number of methods for the rapid identification of diamonds by the naked eye, hoping to help the consumers to purchase diamond jewelry. . In addition, when you are buying diamond jewelry, you must ask the seller for the diamond identification certificate (you must see the certificate issued by the department), in order to ensure the quality of the diamond jewelry purchased, and the quality that may appear in the future. There are evidences in the dispute.
The Kids Footwear collection of JNPFOOTWEAR emphasize in safe and comfortable.
Most of our kids footwear export to Europe and America markets, so all the materials should pass the test. It not only about test itself, as parents , we also want our kids to wear safe kids footwear, so we pay more attention about this part.
Comfortable is another part, we pay more attention on , cause ,kids foot haven't grown up, so they need more foot arch support, so we also pay more attention about that part.
Also kids should have a colourful and happy childhood, so we also hope our kids footwear is colourful and funny for kids. So we make new styles every years ,especially new colour ,materials for our kids footwear collections.
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