How much does a 5.00ct+ I SI2 natural cushion diamond cost?

As of November 2026, 5.00ct+ I SI2 natural cushion diamonds typically cost €49,441 EUR to €216,144 EUR, with a median price of €72,204 EUR. There are currently 39 diamonds matching this specification available across retailers.

Where can I find the best price on a I SI2 cushion diamond?

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5.00ct+ I SI2 Natural Cushion

Quick answer

As of November 2026, there are 39 natural cushion diamonds with I color and SI2 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run €49,441 EUR to €216,144 EUR, with a median of €72,204 EUR.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, September 2026: natural diamonds at 2,335 USD per carat and lab-grown at 443 USD per carat, a natural to lab ratio of 5.3 to 1. Cushion natural stones in the index: 2,948 USD per carat, +1.7% month on month. See the full index release

Figures come from current listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: November 2026

Available

Lowest Price

€20,528 EUR

Highest Price

€393,073 EUR

Average Price

€106,804 EUR

Score Distribution

72 diamonds scored across 4 quality tiers

Excellent

15 (20.8%)

Very Good

19 (26.4%)

Good

14 (19.4%)

Average

24 (33.3%)

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Related Specifications

D IF D VVS1 D VVS2 D VS1 D VS2 D SI1 E IF E VVS1 E VVS2 E VS1 E VS2 E SI1 F IF F VVS1 F VVS2 F VS1 F VS2 F SI1 G IF G VVS1 G VVS2 G VS1 G VS2 G SI1 H IF H VVS1 H VVS2 H VS1 H VS2 H SI1 I IF I VVS1 I VVS2 I VS1 I VS2 I SI1