"Diamonds are long-lasting, a eternal rumor" comes from the advertising words of the jewel king DeBeers in 1951, which was a great success in the United States and successfully opened up the Chinese market. Since then, the Western diamond ring symbolizes that eternal love has penetrated into the hearts of the people and has become an indispensable object for the marriage of Chinese people. As people's living standards improve, the demand for diamonds is gradually diversified. Today, let's talk about the most demanding white diamonds in diamonds (colorless and transparent diamonds).
What is a diamond
In the chemistry class of middle school, we have studied diamonds. The main component is carbon (C). It is formed by the crustal movement under high temperature and high pressure. It is the only single element composed of gemstones with a density of 3.52g/cm3. The refractive index is 2.417 (under 500 nm light wave), the dispersion rate is 0.044, it exhibits diamond luster, the hardness is also the highest in nature, the Mohs hardness is 10, and the thermal conductivity is extremely high.
As early as the 14th century, people began to inlay diamonds before they were processed. In order to chase the bonfire of diamonds, the way of cutting is constantly improving. In turn, today's standard cuts are formed. The standard cut white round diamonds should be 57 faces to 58 faces, (58 faces are cut to face on the basis of 57 facets).
How to tell the truth
How to identify true and false when you buy without the help of professional instruments, here are a few simple ways to introduce you:
01 hand touch
Because the diamond is lipophilic, it has a certain viscosity when touched, it is not easy to slide, and the imitation drill is slippery.
02 anger
The thermal conductivity of the diamond is relatively strong, and a slight breath is approached near the diamond. The fog on the surface of the diamond will immediately dissipate, and the imitation will last for a while.
03 line method
Use an oily pen to draw a line on the countertop (the largest side of the crown), and the oil line of the imitation drill is intermittent or floating.
04 perspective
Diamonds have high refraction, strong reflection on light, and low transparency. Draw a horizontal line on a piece of paper, put the tip of the diamond on the line and directly observe it with the naked eye. If you can see the line underneath, it is not a natural diamond.
05 magnifying glass observation method
Use a 10x magnifying glass to observe the surface of the diamond. Because the diamond is hard, observe the ridgeline of the intersecting surface, it must be sharp, and the imitation is round and even worn. You can also observe the waistline, the real diamond has a granular appearance, and if there is a thin strip of texture, it is a replica.
06 see certificate
The vast majority of diamonds on the market come with a certificate, and you can also ask the merchant to support the re-examination. There are many kinds of certificates for diamonds. The most common ones in China are GIA (American Gemological Institute) and NGTC (National Jewelry Quality Supervision and Inspection Center), as well as EGL (Europe Gemological Institute), HRD (Belgian Diamond Summit), AGS ( American Gemstone Institute), IGI (International Gemological Institute) certificate. In the case of diamonds, the GIA certificate is widely recognized in the market. In the case of the same parameters, the price of a diamond with a GIA certificate is also slightly higher than that with other certificates.
Diamond standard
When it comes to the standard of diamonds, everyone can think of the 4C standard. The 4C standard is an abbreviation for four important indicators of diamonds: CaratWeight, Clarity, Colour, and Cut. After years of marketing and the popularity of the Internet, everyone is already familiar with it.
01 weight CaratWeight
1ct=0.2g, one carat is divided into one hundred percent. As the weight rises, the price increases exponentially. When it comes to a large carat number of diamonds, it is impossible to meet.
02 clarity Clarity
From FL, IF (marked as LC in the national inspection standard) to I (labeled as P in the national inspection standard), that is, from the innocent to the industrial level, the middle also spans six VVS1, VVS2, VS1, VS2, SI1, SI2 Levels, in fact, industrial grades are also subdivided, but they are not suitable for inlaying and will not be discussed here. Because the clarity check is 10 times under the magnifying glass, the inspector manually checks, so when selecting diamonds, the individual suggests to choose SI1 or higher. If you invest as an investment, it is best to choose IF and VVS.
03 color Colour
From D color to Z color, after IJ color, the naked eye can be seen slightly yellow. The identification of the color of the diamond is that the inspector gives the grading by comparing the color stones, but because of the artificial colorimetric, different certificates may have a gradation error, which is acceptable. If you don't compare, and the mask of diamond fire is covered, it is difficult for ordinary people to distinguish the color grade, so if it is not for investment, you don't have to blindly pursue high-color diamonds. With the rise of the color diamond market, some unscrupulous merchants will pretend to be yellow diamonds in colored diamonds with KZ white diamonds. If you want to buy colored diamonds, you need to be vigilant.
04 Cut Cut
As the only human factor among the four major indicators, the quality of the cut determines the brightness and fire of the diamond. Its grades range from high to low (Excellent), VeryGood, Good, Fair, Poor. Personal advice, this aspect does not need to save, of course, VG is also a good choice for cost-effective.
In addition to the well-known 4C above, there are some other parameter standards that will affect the price of diamonds.
05 degree of modification Finish
There are two parameters below: Polish and Symmetry, also evaluated as Excellent, VeryGood, Good, Fair, Poor. Good polishing will increase the brightness of the diamond, and a good cut will make the diamond symmetrical. Together with the perfect cut mentioned above, this is the 3EX cut that is often heard outside.
06 Fluorescence Fluorescence
It is a natural phenomenon that diamonds are fluorescent. They are classified into five grades according to the intensity level: None, Faint, Medium, Strong, and VeryStrong. Because it is a natural factor, and fluorescence does not affect the quality of the diamond, strong fluorescence will make the diamond's luster unclean, so the diamond with fluorescence will be slightly lower than the price without fluorescence. Fluorescence is not equal to radiation, and you can choose it with confidence. If you wear it yourself, you can choose according to the budget. If you are investing, it is recommended to buy as much as possible without fluorescence.
Talk about shaped drill
The circular standard cutting is recognized as the most beautiful way to express the beauty of diamonds, perfect for displaying the diamond fire color. However, in order to maximize the use of diamond blanks, and at the same time pursue the appearance and reflect the cutting technology, people also use many other kinds. Heteromorphic cutting, the cut diamonds, we are collectively referred to as shaped diamonds.
There are now more than a dozen shaped diamonds, such as drop-shaped, emerald-shaped, princess-square, rectangular, elliptical, triangular, Radiant, oval, pear-shaped and so on. Like the white round diamond, the white shaped diamond also uses the same set of rating standards, but because the cuts are often different, the standards are different, so when the GIA rating, the cut diamond has no cut rating, only polished and Symmetric rating.
In order to maximize the use of diamond blanks, the diamonds on the market are usually shaped, and their prices are often astounding. However, when used as a wearing option, the price of diamonds with the same parameters is often higher than the standard. Round diamonds are cheap. Diamonds are permanent and love is deep, but they must be measured according to the actual situation when buying. Do not compare.
TIPS identification method
With the certificate, often everyone is not at ease, then you can ask the merchant to help you find the laser code on the diamond waistline, compare this with the certificate code, and at the same time pass the GIA website, the authenticity of the certificate.
This method applies to GIA certificates
In order to not affect the fire color, some diamonds do not have a laser code on the waistline. This has to be compared with the “瑕疵 图示 图示 上 上 上 , 专业 专业 专业 专业 专业 专业 专业 专业 专业 专业 专业 专业 专业 专业 专业 专业 专业 专业 专业 专业 专业 专业 专业 专业 专业At the same time, it is recommended that you go to a professional, responsible business to make a purchase.
Although the diamonds are extremely hard, they are not unscrupulous to wear. Do not hit hard, otherwise the diamond itself will have an impact on the inlay process.
Diamonds are lipophilic, so after wearing them for a long time, wipe them with a soft cloth. If you see a diamond with a "朦朦胧胧" surface at the time of purchase, you should be careful. If it is still the same after wiping, it may be the so-called "milk drill" in the industry. The GIA test does not have this item, even if it is high in color. Clarity, with "beauty", the price of diamonds is greatly reduced.
It is best to store the diamonds in a ring box. Do not mix with other jewellery to prevent other jewels from being scratched. Although the diamond is generated by high temperature and high pressure, the ignition point in the atmosphere is only more than 800 degrees. Do not try it, it is good for dead cats.
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