“Distinguishing between natural diamonds and lab-grown diamonds produced by the CVD (Chemical Vapor Deposition) method can be quite challenging, especially to the naked eye. However, there are several methods you can use to test and differentiate them:
- Check for metal content: A simple way to test a natural diamond is to use a magnet. Natural diamonds usually do not react to magnets. However, many CVD lab-grown diamonds are created using a metal coating, so they can be attracted by a magnet.
- Use lighting: Place the diamond under a strong light source and observe if it reflects light from its surface without any alteration. Natural diamonds typically exhibit a full and brilliant light reflection, while CVD lab-grown diamonds may appear duller or not reflect light in the same way.
- Use specialized magnification: Use a specialized loupe with the ability to differentiate between natural and lab-grown diamonds. Use a UV light to see if the diamond fluoresces under UV light. Natural diamonds typically fluoresce under UV light, while CVD diamonds usually do not.
- Inspect the interior of the diamond: If you have access to the interior of the diamond, you can examine any inclusions and crystal structures. Natural diamonds may have natural inclusions and irregular crystal patterns. In contrast, CVD lab-grown diamonds often have a more uniform crystal structure with fewer inclusions.
Please note that with continuously advancing technology, some lab-grown diamonds can be very difficult to distinguish from natural diamonds. Therefore, if you are uncertain, it is advisable to seek the opinion of a diamond expert or use professional gemstone evaluation services to ensure the authenticity of the diamond.”
As for the question about the value of natural colored diamonds, the English translation already covers the topic in the original response. If you have specific questions or need further information, please feel free to ask.