For crystal culture, its history is relatively long. In ancient times, there was such a name: water jade, water, water, water, etc., showing how noble its status is. The bracelet made of it is not only beautiful, but also cool, it is suitable for wearing in the hot season. There are also a variety of "crystals" on the market. Is it really crystal? How to choose? 1. Hardness: Dear, do you know the hardness of the crystal? The Mohs hardness is seven. In other words, it is only lower than the three minerals such as diamond, corundum, and topaz, which can be used to mark the surface of glass or metal. If it is imitation, there will be no such traits, and it may leave traces in itself. 2. Weight: The density of crystal is 2.60~2.66, while that of plexiglass is 2.5. Therefore, if the bracelet is held in the hand, the crystal will be heavier, and the glass material will be relatively light. 3, cold and through the bone: the characteristics of the crystal is very cold, wearing on the hand is also cool, even in the hot summer will not "heat up" fever. It's not like the coolness of ice, it's just lower than our normal body temperature. If you lick it with your tongue, you will feel cool. At the same low temperature, natural crystals give a feeling of coldness and bone. If it is a fake bracelet, there will be no such cool feeling. 4. High temperature: The melting point of crystal is also high, that is, it can be melted at 1713 °C. It is fired at 800 ° C and then placed in cold water. There is no possibility of cracking. (This method is dangerous. We should not do this for safety reasons when choosing bracelets.) The counterfeit glass bracelet does not have a certain melting point and will burst when placed in high temperature water. 5, hair silk: our hair can also identify the true and false of the crystal. Unplug one of the hair on the table and place the bracelet on top of it. If the hair strand seen is double shadow, it is crystal because it has birefringence. I still see a hair, and the probability of the bracelet being glass is more. 6, catkins: crystal in the process of formation, affected by the surrounding environment will contain some impurities in it. Therefore, if you look at the light in a bracelet, you can see a small catkin-like substance or a cloud-like phenomenon. For glass, there will be some bubbles or no streaks, because making such a program is more labor-intensive and economical. Satin Fabric,Satin Cloth,Cotton Satin Fabric,Printed Satin Fabric Zhejiang Province Changxing Silk Co.,Ltd , https://www.cx-fabric.com