[Jewelry Identification] 3 major folk jewelry testing methods
There are many folk jewellery detection methods in the jewelry market. Many people like to use these methods to detect when buying jewelry and jade. But whether these methods can be 100% true and false, remains to be verified. Today, the Jewelry class has compiled 3 common jewel folk detection methods to share with everyone, and make a reference when consuming. First, verify the natural jade with ultraviolet light First of all, let's first know the level of jadeite. Nowadays, jadeite is usually divided into A, B, C and B+C grades. The so-called A goods are the natural jade we often say, and the B goods are artificially filled jadeites. C goods refer to jadeite that has been artificially dyed by high pressure and high temperature, and B+C goods are jadeite that is both filled and dyed. Discrimination principle: Because natural stone does not have a fluorescent reaction, natural jade does not emit light under the irradiation of ultraviolet light. Experts explained: Because the filler in B jade and B+C jade is mainly epoxy resin, it will show fluorescence reaction in UV lamp, which is helpful for screening jadeite, but C jade is not filled, just dyed. Also, there is no obvious reaction under the ultraviolet lamp, so the ultraviolet lamp can identify the filled jade. 2. Verify natural diamonds with paper and pencil The market usually uses the "cubic zirconia" jewelry to make the imitation of the diamond. From the appearance, the two are very shiny, shining brightly under the light. Discrimination principle: draw a straight line with a pencil on a white paper. When the two gems are face down and point upwards on a straight line, looking down through the tip, the natural diamond does not see the line drawn, and zirconium The stone can see the curved arc. Experts explain: This is because diamonds have the highest refractive index among all gemstones, and the diamonds to be made into jewelry also require better cutting, so the light that hits the diamond cut surface is almost completely reflected, looking perpendicularly from the tip. Almost nothing can be seen, and the refractive index of cubic zirconia is not so good, and the light will leak a part of the reflection, so the deformed lines can be seen. However, if you want to truly distinguish between true and false diamonds, you must go to a formal testing agency. Third, the buoyancy of water to verify natural amber The natural amber texture is very light and can be distinguished by the principle of density. Discrimination principle: The uninlaid amber is placed in a saturated saline solution, and the natural amber can float. Experts explained that the density of saturated brine is 1.33g/cm3, and the density of pure natural amber is between 1.05g/cm3-1.10g/cm3, which is lower than that of saturated brine, so it can float, but the pressed amber is made of natural amber. The trim is pressed together and its density is similar to that of natural amber, so it can float on salt water. Therefore, this method cannot distinguish between natural amber and pressed amber.
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