Jewelry Appraisal: Glass posing as tourmaline

On the morning of August 2, Jinan Quality and Technology Supervision Bureau and the Tianqiao Branch of the Bureau of Quality Supervision jointly organized the “Measuring Huimin into the Community”. At the event site, hundreds of people surrounded the quality inspection personnel who came to engage in activities. I hope that I can let experts identify the true and false baby.

The quartzite staining posing as jadeite citizen Ms. Wang came to the scene early and she took out a translucent white donut she bought in Beijing. "The donut was bought five years ago. At that time, it cost more than 800 yuan. It was Hetian jade. I don't know whether it is true or not," said Ms. Wang. At the event, the staff of the Shanghai Municipal Bureau of Quality and Technical Supervision of the Bureau of Quality and Glory Inspection put the donut into the refractometer. After some tests, he told Ms. Wang that the donut was not Hetian Yu but a glass product.

Detector Zhang Zhongqiang explained that different materials have different degrees of refractive index of the jade, so they can be distinguished by the refractometer. Under normal circumstances, the refractive index of jade is 1.61, the refractive index of jadeite is 1.66, and the refractive index of glass is only 1.50. Ms. Wang's safe deduction luminosity is 1.54, which is closer to glass products. He told reporters that in the tests that were done before, many jades that look very transparent are actually made of glass.

Tourmaline is a kind of gem that has recently become popular in the collectors' world. Prices have been rising all the time recently, but at the inspection site on the 2nd, the inspection personnel discovered the glass posing as a tourmaline. "Now the price of one carat tourmaline is generally more than one thousand yuan. If it is glass, it will be worth a few dollars. The difference is too great, so remind everyone to buy such jade must go to a regular business, buy goods with an identification certificate." Zhang Zhongqiang Say.

From just 9:30 in the morning to 11:30 in the morning, the inspectors of the Bureau of Quality Supervision and Inspection have already conducted inspections for hundreds of pieces of jewelry. Zhang Zhongqiang told reporters that it was estimated that at least half of the hundreds of items were fake products. Many of them are made of quartzite imprinted as imitation jadeite, this situation is easier to distinguish, and a person with knowledge can see it with the naked eye. There are also some jades that are poorly tinted. After being pickled and transformed into jadeite, which is commonly known as “B goods,” this requires the use of equipment such as ultraviolet fluorescent lamps for professional detection.