Tourmaline is a favorite mid-range gemstone variety, known as the October birthstone. As the crystal heats up, the price of tourmaline also rises. Merchants use fakes to make consumers mislead consumers, let consumers spend big money but buy fakes. So we need to understand the method of identification of tourmaline.
The tourmaline is rich in color and is the most precious gemstone in natural gemstones. There are many similar gemstones, such as rubies similar to red and pink, ruby, red spinel, spodumene, orange-red topaz, and red beryl. Blue tourmaline-like gems have blue spinels; gems similar to green tourmalines have chrome-containing diopside, emerald, green beryl, etc. The main difference between tourmaline and these gems is its unique thermoelectricity, ie After rubbing the tourmaline on a soft cloth, the heat generated can absorb the close paper dust, plus the strong two-color and the obvious ridge line double shadow. These characteristics are not found in other gemstones. So through these two points, you can basically distinguish the tourmaline from other gems.
However, there are some other materials with counterfeit tourmalines that have similar characteristics to tourmalines, such as synthetic two-color crystal, glass, fluorite, which requires a little attention.
The distinction between crystal and tourmaline is mainly to see their color. Generally speaking, crystal is not red and green like tourmaline. Crystal purple is more common, but tourmaline does not have this purple only purple! Therefore, it is possible to use the difference in color between the two to roughly distinguish between true and false. Synthetic crystal has the unique thermoelectric effect of tourmaline. Its two ends are brownish green and maroon, the color is dark, with gray tones, and the two color boundaries are clear. There are also several straight ribbons in between. The birefringence is small, and the low-edge double shadow is clear without the tourmaline. In addition, the two-color is not as clear as the tourmaline.
The glass has a variety of bright colors and looks similar to the tourmaline. The true and false distinction between glass and tourmaline is most obvious. From the perspective of internal inclusions, there are often small round bubbles in the glass. If you see such a feature, you can basically conclude that the glass is not a tourmaline! There is also a way to pretend to be a tourmaline in glass. That is to use a burst of glass to pretend to be a relatively coarse tourmaline. This type of glass is usually dyed after bursting. Therefore, the color dyes are concentrated in the cracks, and the light transmission is easy to distinguish!
There is also a phenomenon in which glass is used to synthesize a similar faceted tourmaline gemstone, so that the surface of the glass looks like a tourmaline, but the tourmaline has dichroism and birefringence, which are not available in glass! Just watch the comparison carefully and you will find it! Moreover, the tourmaline, which is generally used as a gemstone, has an identification certificate. The glass of the tourmaline will not have a formal identification certificate!
The true and false identification of fluorite and tourmaline can be compared firstly from the hardness. The hardness of tourmaline is 7.5 degrees Mohs, and the hardness of fluorite is only about 4 degrees Mohs. Both can compare the hardness by drawing glass! Secondly, because the hardness of fluorite is low, the luster of fluorite jewelry is far less than the tourmaline!
Another point is that fluorite is often used as a multi-color material when posing as a tourmaline, and there is no purple in the tourmaline. Just as the multi-color of fluorite often appears purple, this is also effective in distinguishing between true and false fluorite and tourmaline. means!
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