Market analysis: A 5 + carat, D‑color, IF/FL diamond with excellent cut and polish has historically delivered substantial appreciation—often doubling in value or more over 20 years, with annual nominal gains of 4–6%, driven by their extreme rarity and sustained premium appeal. Large D‑color, IF/FL (5 ct+) diamonds have clearly outpaced mainstream white diamonds in long-term yield. As global supply of top-grade stones dwindles, demand from discerning investors and collectors continues to rise, driving enduring appreciation.