Tourmaline is known as the "Colorful Supreme" and "the rainbow that falls into the world". But nowadays, many of the colorful tourmalines in the antique market are reliable. The following are the hands and feet of unscrupulous merchants who are constantly moving towards the tourmaline.
Means 1: Dyeing treatment. Dyed light-colored tourmalines into dark colors, or dyed colorless ones into colored ones.
Discrimination: The naked eye, or with a ten-fold magnifying glass, there is a staining agent in the tourmaline crack.
Means 2: heat treatment. The treatment of dark colors into light colors, such as the treatment of green tourmalines into light blue-green, reaches the standard commonly known as "Paraiba" to sell high prices.
Discrimination: Observe the original gas-liquid inclusions with a ten-fold magnifying glass. The heat-treated tourmaline can generally see radial whiskers on the edges of the inclusions. In addition, the transition of multi-color and two-color tourmaline colors will appear similar to the wave pattern.
Means three: diffusion treatment. This is the latest counterfeit means, first appeared in the tourmaline produced in Africa, mostly to spread the light blue surface into dark blue.
Discrimination: There is a crack in the tourmaline when the heat is uneven. Put the tourmaline into the water and you can see that the color of the edge is deeper than the middle.
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