Title: "Crystalline Signatures: Advanced Photoluminescent Profiling of Multi-Origin CVD Synthetic Diamonds Versus Natural and HPHT Counterparts" Abstract: This investigation delineates the spectroscopic and gemological 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 including DiamondView™ imaging, FTIR spectroscopy, and photoluminescence 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 detection framework that integrates luminescence mapping and defect spectroscopy, enhancing the reliable segregation of CVD synthetics from natural and HPHT diamonds within the gemological pipeline.