Magnifier, spotlight pencil flashlight, rectangular flannel bottom box and desk lamp are the most basic and commonly used appraisal tools for jewelry appraisers. Pick up a piece of jewelry to be tested and put it under the magnifying glass of 10 times. It only takes a few tens of seconds to reach a conclusion. At first glance, behind it is the knowledge of jewelry appraisers about all kinds of jewelry and jade and the accumulation of experience for many years or even more than ten years. It seems simple, but it is extraordinary.

diamond identification

Diamond is the hardest substance in natural materials. A diamond can mark any other gem, but no other gem can mark a diamond. The most accurate and reliable identification method is to use "thermal conductivity meter" to measure the data of thermal conductivity to identify genuine and fake diamonds, but "thermal conductivity meter" is more expensive. Because diamonds are noble and luxurious jewelry products, it is not uncommon to replace or counterfeit diamonds with cheap gems, artificial gem and even glass in the market.

Common types of fake diamonds are as follows:

① Zircon: Very similar to diamond, it is the best substitute for diamond. The identification method is that zircon has polarized light and large birefringence. Observing the edge of processed zircon with a magnifying glass of 10 times, it can be seen that the bottom edge line has obvious double diamond shape, and there is no ghost phenomenon.

② Glass: The refractive index of glass is very low, and there is no colorful light flashing like a diamond; Especially when submerged in water, the glass products have no luster at all, and the clogs are immediately exposed.

(3) Soviet diamond: cubic zirconia, first developed by the Soviets, hence the name. Soviet diamonds are synthetic, but they are very close to natural diamonds in dispersion and refractive index, and they also have a sparkling and charming appearance. But its hardness is low (8.5), which can be distinguished from diamond. And the thermal conductivity is much lower than that of diamond, so it can be accurately identified and distinguished by "thermal conductivity meter".

④ Crystal: Although crystal is a natural mineral transparent crystal, it looks like a diamond after processing, but it lacks the colorful light of diamond.

Because of the high value, investment prospect and non-renewable mineral resources of jewelry itself, more and more consumers and investors pay attention to the jewelry market. Most consumers lack the knowledge and tools to distinguish authenticity. Criminals often use fake and shoddy goods to grab high profits, and buyers are prone to serious economic losses. A large number of fakes increase the risk of buying goods and disrupt the market order. Therefore, it is extremely important to identify true and false jewelry. Many fake masters also take the opportunity to make profits.