To check if a diamond is CVD (Chemical Vapor Deposition) created, there are several methods:
1. Strain Pattern: A CVD diamond has a unique strain pattern that differs from natural diamonds. However, identifying these patterns requires specialist gemological knowledge and may be difficult even for top gemologists.
2. Fluorescence: CVD diamonds often exhibit strong red fluorescence under UV light. This can be a distinguishing characteristic, but it's important to note that lab-grown diamonds from reputable sources may have no fluorescence or only faint fluorescence.
3. Laboratory Analysis: Diamond laboratories, such as GIA (Gemological Institute of America), can use specialized equipment to detect minute trace elements like silicon that may be present in CVD diamonds. This requires submitting the diamond to a laboratory for analysis.
4. Grading Report: The easiest way to determine if a diamond is CVD created is by checking the diamond's grading report. The report will specify how the diamond was grown, indicating if it is a CVD diamond or not.
It's important to ensure that when purchasing a CVD diamond, it is certified by a reputable grading institution such as GIA or IGI (International Gemological Institute). The accompanying certificate will provide detailed information about the diamond, including its origin and any post-growth treatments it may have undergone. Diamonds with post-growth treatments should be avoided.
It is worth noting that visually, it is difficult to distinguish between a CVD diamond and a diamond created using the HPHT (High Pressure High Temperature) method. Both methods create diamonds that are optically, chemically, and physically identical to natural diamonds. Therefore, relying on laboratory analysis and certification is crucial for identifying CVD diamonds accurately.
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