Larger natural diamonds retain per-carat premium over lab-grown stones, analysis finds

Natural diamonds continue to hold a per-carat price advantage over lab-grown synthetic diamonds, according to a comprehensive analysis of online sales data. The study, published in the International Journal of Electronic Marketing and Retailing, examined nearly 200,000 diamond listings from an online retailer. Over 75% of these were natural diamonds, while the remaining were lab-grown. Researchers found that carat weight remained the primary factor influencing price for both types of diamonds, followed by color and clarity, attributes that describe a stone’s hue and the presence of internal or external flaws. The study focused on comparing prices within subgroups defined by carat ranges, color, and clarity, analyzing both round and intricately shaped stones. In every subgroup of the round-diamond analysis, larger natural diamonds maintained a higher per-carat value than their lab-grown counterparts. A similar pattern emerged among intricately shaped stones. These results reinforce the argument that natural and lab-grown diamonds should be considered distinct market segments, despite their identical chemical composition and crystal structure. Lab-grown diamonds are created through artificial processes such as high-pressure, high-temperature synthesis and chemical vapor deposition. By contrast, natural diamonds are formed deep within the Earth over millions of years. While both types of diamonds share the same elemental makeup, their origins and perceived value differ significantly. The study highlights that the price disparity is not solely based on physical properties but reflects broader social and cultural factors associated with rarity, provenance, and the concept of luxury. Researchers suggest that the observed price differences could support efforts to treat lab-grown diamonds as a separate category within the jewelry industry. This distinction would allow for more nuanced approaches to pricing, investment strategies, and consumer perception. The analysis also provides a framework for understanding how traditional valuation criteria apply to the emerging lab-grown market. As demand for sustainable alternatives grows, the role of lab-grown diamonds in the global gemstone trade continues to evolve. The findings raise questions about the economic and cultural significance attached to diamonds. Despite being composed primarily of carbon, their value is largely influenced by human perceptions of scarcity, authenticity, and exclusivity. The study invites reflection on why such a substantial portion of their worth stems from socially constructed ideas rather than intrinsic qualities alone. The research team, led by Chong Huang and colleagues, conducted the analysis to better understand how different attributes affect pricing in both markets. Their work contributes to ongoing discussions about the future of the diamond industry, particularly as lab-grown options become more accessible and accepted. With increasing consumer interest in ethical sourcing and sustainability, the distinction between natural and lab-grown diamonds may grow even more pronounced in the coming years.