The difference between tourmaline and ruby

What is the difference between tourmaline and ruby? If you are not very familiar with these two items, Xiao Bian suggests that you first check the relevant information, and have a simple understanding of this. If you don't know anything, you can't distinguish them. Today, Xiaobian will teach you how to distinguish between tourmaline and ruby. Let's take a look at the specific method.

There are many red gems that are confusing with rubies, including red spinel, red garnet, red tourmaline, red zircon, glass and true and false two-layer stone.

The difference between ruby ​​and other red gems is mainly based on hardness testing. Because the hardness of ruby ​​reaches 8.8 to 9 Mohs, the hardness of other possible substitutes is lower than it. For finished products that have been honed, it can be used to score standard hardness sheets such as topaz and crystal to determine the hardness. According to the hardness, it can be roughly confirmed whether it is ruby.

In addition, the red hue according to ruby ​​is also distinguished from one of the characteristics of other red gemstones such as red tourmaline.

One of the methods is to measure the refractive index of the garnet-like magnesia-alumina with a refractive index similar to that of ruby, which has a refractive index between 1.74-1.75, which is lower than ruby; and the red tourmaline has a refractive index between 1.624 and 1.644. Sometimes iron-aluminum-magnesium aluminum garnet may be mixed with Thai rubies, but the colors are very different.

In the second method, except for the artificial ruby ​​and red tourmaline, the other red varieties have no dichroism. The redness of the red tourmaline is similar to that of the ruby, but under the Chelsea filter, the red tourmaline does not show red fluorescence (note that the red color of the red tourmaline is due to the chromium content, and the fluorescence reaction is seen under the color filter. But it can be distinguished from hardness).

As long as the second layer of stone is carefully observed, it is not difficult to distinguish. That is, remove the ornaments from the support and put them into a bottle filled with water. Look carefully from the waist of the gemstone. Because the two layers of stone are made of two red varieties, the colors are very different and can be easily seen in the water. In addition, the waist was observed with a magnifying glass of 10 times, and the bonding lines and the bubbles in the bonding place were observed. Another reliable method is to measure the refractive index of the upper and lower layers, the difference is the two-layer stone.

Tourmaline is very well distinguished from ruby ​​and can be distinguished by the color of the gemstone. However, this is just a way of distinguishing. Any different item has its own unique side. As long as you carefully observe it, you will always find the difference. This is just some way to distinguish between tourmaline and ruby. As long as you are interested, you also You can find out different ways to distinguish.

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