In the ruby ​​grading, in addition to cut, clarity, color and weight, transparency is also an important part. What is the transparency of ruby? How is the transparency graded?
Transparency: refers to the extent to which a gemstone allows visible light to pass through. In the naked eye identification of rubies, the transparency is generally divided into five levels: transparent, translucent, translucent, sub-transparent, and opaque.
Transparent
It allows most of the light to pass through, and when you look at the objects behind it through the gemstone, you can see clear outlines and details.
2. Sub-transparent
It can allow more light to pass through. When observing the object behind it through the gemstone, the outline of the object can be seen, but the details are blurred.
3. Translucent
It can allow part of the light to pass through. When observing the object behind it through the gemstone, only the outline shadow of the object can be seen, and the details are not visible.
4. Sub-transparent
Only a small amount of light can pass through the edges of the gemstones, but the objects behind them cannot be seen through the gemstones.
5. Opaque
Basically, light is not allowed to pass through, and light is totally absorbed or reflected by the object.
At present, the most authoritative international certificate for ruby ​​grading certificate is GRS. There are more detailed parameters, including color description and origin identification. The conclusion of domestic CMA certificate test is also credible. If the domestic certificate has CNAL mark better. (International Mutual Recognition Mark).
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