1, tourmaline has birefringence.

The natural tourmaline is placed in the palm of your hand, and when you look inside through the light, the more you look, the less clear it is. The real tourmaline is because of its birefringence. We can take advantage of this feature, put it in the palm of our hand, and look in from the larger side of tourmaline, and the real tourmaline is becoming more and more blurred. The fake tourmaline is getting clearer and clearer.

2. Multi-angle observation

From different angles, the color of natural tourmaline is different in every angle. Look at the color, tourmaline has many colors, including red, rose, pink, yellow, blue, green, brown, black, and very few purple. Even if there is, it is a light purple, unlike the purple of crystal. If you see a strong purple, it means it is a fake tourmaline.

3. Look at this texture

There are some cotton cracks and inclusions in natural tourmaline crystals, and the price is different according to different colors. If the tourmaline you buy is very bright in color, very transparent and very cheap, then you should pay attention to its authenticity.

In addition, the color fake tourmaline bracelet is bright but not soft, and the internal color is uneven under the light. The real tourmaline has a natural growth line, which is unique to tourmaline, and other natural minerals cannot be impersonated.

Step 4 detect refractive index

We can test their refractive index by identifying refractometers with instruments. Each gem has different light refraction parameters. According to these parameters, we can determine whether it is tourmaline, and the crystal is different from the measured parameters. Tourmaline refraction data are accurate between 1.624 and 1.644.

5. Look at this color

When distinguishing between crystal and natural tourmaline, the colors of crystal and tourmaline mainly depend on their colors. Generally speaking, crystal is not as red and green as tourmaline, and crystal violet is more common, but tourmaline has no amethyst violet, only violet! Therefore, the color difference between the two can be used to roughly distinguish between true and false.

Extended data:

Tourmaline variety:

1, Blue Tourmaline: Blue Tourmaline is very rare, and now it has become the most valuable color among tourmalines. It is produced in yellow clay of weathered granite in Siberia, Russia, and also found in Brazil, Madagascar and the United States.

2. Red tourmaline: Red tourmaline is best in purplish red and rose red, but it is mostly produced in brown, brownish red and crimson in nature, and its color changes greatly. At the same time, its specific gravity will change with the change of color, and the specific gravity of crimson is higher than that of pink. ?

3. Brown tourmaline: Brown tourmaline is dark in color and rich in chemical element magnesium. Brown tourmaline is mostly produced in Sri Lanka, North America, Brazil and Australia. ?

4. Colorless tourmaline: Colorless tourmaline is extremely rare. It is only produced in Madagascar and California, and it is rare. It should be noted that some colorless tourmalines on the market are made of pink tourmalines by heating. ?

5. Green tourmaline: Green tourmaline is the most common of all tourmaline color varieties, so its value is also the lowest, mostly produced in Brazil, Tanzania and Namibia.

Baidu encyclopedia-tourmaline