Whether the color of 1. tourmaline product has been treated with naked eyes is difficult to distinguish from the surface. Generally, infrared light is used for analysis. In fact, the natural tourmaline itself has many colors, which are natural and unique, but it is rarely falsified in color. So you can rest assured about the color, as long as you have a formal test certificate, so can your string.

2. Infected and dyed jewelry such as jadeite dyeing, quartzite jade dyeing (commonly known as Ma Laiyu) and quartzite jade dyeing (mixed with topaz in the market) is not good for human body. However, agate, some crystal products, Hong Fei and other products will be baked and colored. The principle is to oxidize their inherent low-priced metal elements (such as ferrous iron to ferric iron, etc.). ) make them change color, generally will not cause harm to the human body, so the national standard is recognized.

3. Some brightly colored products, such as blue and green in agate, are dyed first and then baked instead of simply baked. However, this process is relatively mature, generally does not fade, and the harm to the body is controllable, so agate products are generally safe. But agate colored products can be used as ornaments, but they are too inferior as jewelry.

In addition, the most common manual treatment of tourmaline, more like the transparent treatment of jadeite, is to inject glue after corrosion with strong acid to enhance the crystal permeability and perfection, which is the most important thing to pay attention to.

Furthermore, in order to make money, some businessmen sometimes add a few crystal beads to tourmaline necklaces for profit, which also needs attention.

In addition, the purchase of tourmaline is reliable as long as there is a national inspection certificate.