September natural diamond pricing reflected firmer premiums at the top end, selective demand across the mid-range, and early signs of stability in lower-grade diamonds. Lab-grown diamonds continue to pressure broad consumer segments, while natural diamonds demonstrate differentiated performance by color and clarity, reinforcing a segmented market structure.
Premium Grades
Top-quality diamonds recorded some of the strongest month-on-month gains in recent reporting. D/FL advanced sharply from $12,698 in August 2025 to $17,542, while D/IF edged higher to $13,504 (from $13,178), remaining securely above the $13,000 average price point. E/FL climbed to $12,950 and E/IF to $11,467, with the latter rebounding significantly from August’s softer showing. F/IF was the exception, easing to $10,589 (from $11,232), though still trading within its established range.
This segment continues to benefit from scarcity and investor-led buying. The widening spread between D/E and F-color premium diamonds suggests that color is once again a decisive factor for high-end buyers, with demand concentrated on the rarest, most desirable categories.
Mid-Range Grades
Performance across the mid-tier was mixed, reflecting value-driven buying. F/VVS1 adjusted modestly to $9,185 (from $9,009) and E/VVS2 increased to $8,493 (from $8,175), while F/VS1 strengthened to $7,830 (from $7,433). In contrast, G/VS2 slipped to $5,371 (from $5,551) and H/VS2 declined more noticeably to $3,563 (from $4,232).
The results highlight ongoing buyer discrimination within this segment. Higher-color mid-range diamonds continue to attract stable demand, whereas lower colors face pressure as consumers weigh natural options against competitively priced lab-grown diamonds.
Lower Grades
Entry-level categories showed tentative stabilization. J/SI1 rose to $2,729 (from $2,558) and K/SI2 advanced to $2,074 (from $1,937), suggesting targeted demand at specific color-clarity intersections. G/SI2 remained steady at $3,114 versus $3,190 in August. I/SI1, however, weakened to $2,849 (from $3,275), reflecting persistent price sensitivity where inclusions are more visible.
Overall, lower-grade diamonds remain vulnerable, but selective categories are showing early indications of support, hinting at a potential floor.
Market Implications
September’s results emphasize the market’s tiered dynamics. Premium diamonds strengthened on scarcity and long-term value perception, mid-range stones reflected selective demand with color playing an increasing role, and lower-grade categories showed the first signs of price stability.
