Taiwan Province Province produces a kind of blue-purple spar, which is called blue velvet because of its color. Blue velvet is healthy, auspicious and healthy. At 1985, coral pond almost dried up due to severe drought. At that time, a blue transparent stone was picked up by villagers who were repairing fishing nets by coral pond and handed over to local geologists. Because the hardness is about 7-7.8 degrees, it is a local spar. There are three classifications of blue velvet crystals in the industry: the first is 5A, the first is horizon, and the second is transmittance, 1: 5A, which is a classification in the industry. AA grade: the whole blue velvet crystal has no flaws, no artificial defects visible to the naked eye such as cracks on the surface, smooth and delicate as gems and fine holes, and has glass luster after polishing. A 1 grade: there are tiny cracks or tiny natural inclusions, and the cracks are less than 3mm. Polishing has a frosty feeling. Grade A: slightly defective, easily broken by naked eyes. Class AB: large white, yellow and gray inclusions with obvious cracks. Grade B: The whole area is mottled and cracked, and it feels like soil and sand after polishing. . Grade C: the lowest grade, with obvious cracks and impurities on the surface, and rough as bricks after polishing. 2. Blue velvet crystal farmers, this kind of graded beans used in bulk wholesale: the surface is dull, sandy and weak. Ink seed: Ice seed has coarse sand and many impurities on its surface: the surface is as smooth as jade, without impurities, and glutinous seed: the surface is as smooth as a gem, without impurities, as delicate as a gem, and the color is as rich as glutinous rice juice. Static water dragon stone species: bright as a gem, extremely rare. 3. According to translucency, the term translucency itself means not translucency but brightness. The finer the texture, the brighter it will be after polishing. This is the national gem testing standard. The bigger the number, the better the quality. Blue velvet crystal only uses the transmittance when it reaches the gem level, the lowest gem level is 1. The spirituality of blue velvet crystal is 1: it has the characteristic of permanently emitting far infrared rays, and it is a natural protector of cardiovascular and cerebrovascular diseases. 2. It can dredge human meridians, dilate microvessels and promote blood circulation throughout the body. 3. It can decompose harmful substances in blood vessels, remove vascular obstacles and effectively dredge blood vessels. 4. It can regenerate peripheral tissues of blood vessels, activate tissue cells and delay the aging of blood vessels. It can effectively eliminate stress, fatigue and polluted air, and improve health and luck. 6. For people who are easily frightened and have nightmares at night, they can stabilize the space energy field and ward off evil spirits. 7. It helps to protect patients from external interference, concentrate on treating diseases and improve the speed of rehabilitation. Edit the identification method of blue velvet crystal in this paragraph. Blue velvet crystal is also copied in large quantities because of the rarity of red silkworm stone. Therefore, it is necessary to master the basic identification methods. Crystal identification is complicated. As a consumer, you must first ask the seller for proof. The identification result of genuine blue velvet crystal is that it says "blue velvet crystal" instead of other words.