Some people often sell red corundum as the price of ruby. The seductive color and unique charm of ruby ​​have become the hearts of many jewellery lovers. Ruby is also a gem that naturally finds hardness second only to diamonds. So what are the differences between red corundum and ruby? The following is a small series to explain this aspect.
Red corundum
The color of red fused alumina is purple-red and has a strong hardness. It is mainly suitable for making cutting tools. Red corundum is now an artificial product.
The main component of red fused alumina is α-alumina, commonly known as chrome corundum. The hardness of red corundum is higher than that of brown corundum; the toughness is higher than that of white corundum. Grinding tools made of raw materials are suitable for grinding high carbon steel, high speed steel and thin wall parts thereof. Abrasives can also be used for grinding, polishing materials, precision casting sand, spray materials, chemical catalyst carriers, special ceramics, advanced refractories. Wait. Red fused alumina is a natural unprocessed ruby ​​rough.
ruby
Ruby is a gem-quality corundum of red, dark purple, purplish red, and orange-red.
Ruby has a chemical composition of aluminum oxide and contains a small amount of chromium, iron and titanium. Red to pink due to trace element chromium. The color distribution is often uneven, with ribbons or patches.
The crystal form is often in the form of a barrel, a short column, a plate, etc.; it has a flat crystal growth pattern.
The aggregates are mostly granular or dense blocks. Hardness is 9, second only to diamond; no cleavage, crack development; brittle.
The density is 3.95-4.1 g/cm 3 and the specific gravity is 3.97-4.05. Transparent to translucent; glass luster. The refractive index is 1.76-1.77, and the birefringence is 0.008-0.010.
The dichroism is obvious and is a heterogeneous body. Under long- and short-wave ultraviolet radiation, red and dark red fluorescence: those with high chromium content have strong fluorescence. The visible light absorption spectrum has obvious absorption lines at 694.2 nm and 682.8 nm in the red region: from 620 to 540 nm, there is a broad absorption band; at 468.5 nm, there is a weak absorption line.
The difference between ruby ​​and artificial red corundum:
1. Using hardness to distinguish, the hardness of ruby ​​is 9, and the hardness of red fused alumina is 8.5, which is smaller than ruby. Just use the edge of the ruby ​​to trace the red fused alumina, the stroker is ruby, and the person who is not moved is not red fused alumina. . However, this method is a bit risky and should be used with caution.
2. Color difference, red corundum color is uniform, clean, there are few flaws in the crystal, if it is natural ruby, there are natural flaws, such as: cotton, grain, crack, etc., uneven color, some inside the gem There are also polygonal or triangular blisters.
3. Spectrometer to identify: the natural ruby ​​can be seen in the blue part of the spectrum, the black line with a wavelength of 450mm, which is summarized by the appraisers combined with years of experience, there is a black strip is natural ruby, if not, it is artificial red corundum .
4. Use the light to take out the ruby ​​in the sun. If it can reflect the beautiful six-shot star light, referred to as the six lines, this is caused by the special structure of the natural ruby. If not, it is red fused alumina.
5. Inclusion method, the common natural ruby ​​has many cracks inside, and the natural ones are rarely perfect. Because it is formed in nature, there are some fragments or small gaps inside. Observe with a magnified microscope, if you can see these is the real thing, and vice versa is artificial.
The above talked about the difference between five artificial red corundum and ruby, but the best method of the jewelry alumni association thinks that the best way is to take the jewelry identification and look at the results, because the artificial technology is now more advanced, maybe natural The characteristics of rubies are also artificial.
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