Rubies and sapphires are called corundum in mineralogy. At present, the production of corundum in the world is very large, but the gem-quality corundum which can be used as red and sapphire is very rare. So how do you identify true and false red sapphires? Mainly based on the following six aspects.
1. Observe the luster of red and sapphire: When we pick up a ruby ​​or sapphire, we can observe whether it is glass or strong glass, especially under the illumination of strong light, the color will become more vivid and bright, local Or the overall has a unique silky flash, the gloss is quite strong.
2, observe the color of red, sapphire: natural red, sapphire tends to be less uniform in color, which can be seen in a soft, linear ribbon distribution or hexagonal growth zone; and the synthetic red and sapphire colors are extremely pure, High saturation and less natural color.
3. Observe the dichroism of red and sapphire: natural red and sapphire often have obvious dichroism. We take the gemstone and observe the different directions of the gem. The ruby ​​can see the red-orange red change, and the sapphire can see the blue color. Green or blue-purple changes; other imitations do not.
4. Observing the processing of red and sapphire: We generally observe that high-quality natural red and sapphire are often oriented during processing, and the top facet is not pleochroic, and it is polished carefully during the processing, and the curved surface is not polished; Synthetic red and sapphire are generally not oriented during processing, and the top facet is parallel to the C axis, so pleochroism is visible and coarser during processing. Visible scratches and chatter marks caused by rapid polishing - fire marks, arcs The bottom surface of the face is often polished.
5. Observe red and sapphire with cat's eye or starlight effect: natural red and sapphire with special optical effects. We observe the eyeliner or star line. The natural red and sapphire lines are emitted from the depth and the starlight is divergent. Irregular, there are bright spots in the middle; and the synthetic red and sapphire has its lines floating on the surface, and the lines are clear and distinct. The star line is more regular, the position is centered, and there are bright spots in the middle.
6. Observe red and sapphire with a 10x magnifying glass: Many natural red and sapphire have cracks or contain some inclusions (eg silk, needle-like inclusions, gas-liquid inclusions, fingerprint-like inclusions, fog). Shaped inclusions, negative crystals, crystal inclusions, growth lines, ribbons, double crystal lines, etc.; but generally synthetic red, sapphire appears to have a lot of bubbles inside the cloud, curved growth pattern (flame melting method) ) or a veil-like droplet, a metallic lustrous platinum platelet (flux method).
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