Crystalline Signatures: Advanced Photoluminescent Profiling of Multi-Origin CVD Synthetic Diamonds Versus Natural and HPHT Counterparts

CVD diamond, synthetic diamond, photolumi-nescence, gemology, DiamondView, FTIR, Raman spectroscopy, melee diamonds

This paper delineates the spectroscopic and gemo-logical distinctions between CVD synthetic diamonds sourced from primary global producers—China, India, and the United States—and contrasts them with both natural diamonds and HPHT-grown synthetics. Through advanced diagnostic tools in-cluding DiamondView™ imaging, FTIR spectroscopy, and pho-toluminescence analysis via EXA™ and laser Raman systems, the study identifies origin-specific luminescent behaviors and structural defects, such as the [Si-V] center at 737 nm, exclusive to CVD specimens. Notably, melee-sized diamonds marketed as CVD were frequently misidentified, with over 90% exhibiting HPHT characteristics. The research establishes a refined detec-tion framework that integrates luminescence mapping and defect spectroscopy, enhancing the reliable segregation of CVD synthet-ics from natural and HPHT diamonds within the gemological pipeline.