Diamond Prices Fall for Rounds in October
Rounds recorded 267 price decreases against 75 increases in October, according to the IDEX Price Report.
Updated on Nov. 1, 2026 in Jewelry
Rounds recorded 267 price decreases against 75 increases in October, while fancy cuts recorded 253 decreases and 134 increases. Downward pressure was concentrated in rounds from 0.40-0.44 ct. through 1.50-1.99 ct.
Why it matters
The October pattern shows a split market in which mid-sized rounds softened while several larger and fancy-cut categories held firm. For buyers of loose diamonds worldwide, price movement varies sharply by size and cut rather than moving uniformly.
The IDEX Price Report recorded 267 price decreases against 75 increases for rounds and 253 decreases against 134 increases for fancy cuts in October. Specific movements included a 4.7% drop for D/VVS1 0.70-0.79 ct. rounds and a 9.1% rise for N/SI3 1.00-1.24 ct. fancy cuts.
The players
IDEX
IDEX is the diamond price reporting service that publishes the monthly price report tracking movements across rounds and fancy cuts.
The details
Rounds in the 0.40-0.44 ct. through 1.50-1.99 ct. range showed downward pressure, while the 0.50-0.69 ct. category recorded only increases and the 0.70-0.79 ct. category recorded only decreases. Increases dominated the 3.00-3.99 ct. rounds category and the 4.00-4.99 ct. and 5.00-5.99 ct. fancy cut categories.
Timeline
October 2026: Rounds and fancy cuts recorded more price decreases than increases.
November 1, 2026: IDEX Price Report published.
Market Landscape
Monthly IDEX price reports have become a benchmark for tracking loose diamond pricing across size and cut categories. The October split between softening mid-sized rounds and firmer larger and fancy-cut stones fits a market where pricing is increasingly segmented rather than moving as a single index.
Buyers comparing loose diamonds may find better value in certain mid-sized rounds where prices fell, while larger and fancy-cut stones saw more increases. Checking size-specific price movements before purchasing can help align a budget with current market conditions.
The takeaway
Price changes in the diamond market vary by size and cut, so comparing specific categories before buying can reveal where value is shifting. Monitoring monthly reports helps identify which segments are softening or firming.
Further reading
Explore more on Jewelry trends and market shifts.
