IDEX Price Report for September: Prices Remain Under Pressure

(IDEX Online) - The overall trend remained downward in September, with price decreases again outnumbering increases in both rounds and fancies. Rounds showed broader weakness, particularly among goods from 0.70-cts to 1.99-cts, while fancies were more mixed but also recorded significant downward movement in several larger categories.

Activity was limited in a number of smaller size categories, but became more pronounced from 1.00-cts upwards. There were pockets of positive movement among larger goods, particularly in selected middle and lower colors, but these were not enough to reverse the overall negative direction.

Highlighted movements

Rounds

0.70-0.79 ct. D-F / IF-VVS1 predominantly -4.0-6.5%, M-N / VVS1 -3.5-6.5%

1.00-1.24 ct. D / VVS2-VS2 -5.5-6.5%, E-F / higher clarities predominantly lower, F / IF +5.5%

1.50-1.99 ct. D-I / higher clarities predominantly lower, I / VVS1-VVS2 -4.5-5.0%

Fancy Cuts

0.80-0.89 ct. D-G / higher clarities predominantly -3.0-6.0%, E / VS1-VS2 -5.5-6.0%

1.00-1.24 ct. D-F / higher clarities predominantly -3.0-6.0%, K / I2 +8.5%, N / SI1-SI2 +7.0-8.5%

5.00-5.99 ct. Decreases dominated; H / VS1 +4.5%, H / SI2-SI3 -5.0%, K / SI3 +6.0%, L-N / I3 -6.0-7.0%

Basis of comparison: IDEX Diamond Price Reports dated 01-August-2026 and 01-September-2026. Percentages shown are month-on-month changes in the published asking-price tables.

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