CVD diamonds can be detected through various methods, including examination of grading reports, observation of strain lines under magnification, fluorescence under UV light, and specialized laboratory testing using spectroscopy, microscopy, and luminescence.
Grading Reports: The easiest method to identify a CVD diamond is by checking the diamond's grading report. This document will specify the growth method of the diamond, indicating whether it is CVD (Chemical Vapor Deposition) grown.
Strain Lines: CVD diamonds sometimes exhibit what appear to be "strain lines" due to their growth process. These lines are not visible to the naked eye and require a loupe or microscope to discern. These lines are a result of the layering process in CVD growth and can be a subtle indicator of the diamond's origin.
Fluorescence: Under UV light, CVD diamonds are known to fluoresce distinct colors, particularly red. However, this characteristic can vary, and some lab-grown diamonds, like those at Ritani, are produced with no or faint fluorescence.
Laboratory Testing: More definitive identification of CVD diamonds is conducted in specialized laboratories. Techniques such as spectroscopy, microscopy, and luminescence under shortwave ultraviolet light are used to determine a diamond's origin. Instruments like the DiamondSure and DiamondView, developed by the DTC and marketed by the GIA, are used to screen and analyze diamonds. These machines work by exposing the diamond to specific types of radiation and analyzing the output, which can reveal characteristic patterns specific to CVD growth. For instance, the DiamondView can show microscopic growth lines indicative of the layering process in CVD diamonds.
Microscopic Analysis: When viewed under magnification, CVD diamonds may show different strain patterns compared to natural diamonds. This requires specialized gemological knowledge and even experienced gemologists may find it challenging to distinguish these patterns.
Trace Elements: Advanced equipment in laboratories can detect minute trace elements like silicone, which might be present in CVD-created diamonds. This analysis requires highly specialized knowledge and equipment, typically available only in laboratories like the GIA.
In summary, while some characteristics like grading reports and fluorescence can provide initial clues, definitive identification of CVD diamonds often requires sophisticated laboratory analysis using specialized equipment and techniques.
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