How much does a 3.00 to 4.99ct I I1 natural cushion diamond cost?

As of November 2026, 3.00 to 4.99ct I I1 natural cushion diamonds typically cost £11,849 GBP to £80,218 GBP, with a median price of £36,304 GBP. There are currently 6 diamonds matching this specification available across retailers.

Where can I find the best price on a I I1 cushion diamond?

About 24% of these diamonds are available at multiple retailers, with an average price spread of 32%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct I I1 Natural Cushion

Quick answer

As of November 2026, there are 6 natural cushion diamonds with I colour and I1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £11,849 GBP to £80,218 GBP, with a median of £36,304 GBP. At least 11 retailers stock this exact specification, and 24% of the stones appear at more than one of them, with an average price spread of 32%. Half of all listings fall between £3,795 GBP and £5,210 GBP per carat.

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

£8,809 GBP

Highest Price

£87,502 GBP

Average Price

£39,349 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

23.8%

Price Spread

31.6%

Price Range

Price per carat distribution across retailers

$6,006/ct

10th Percentile

$4,041

Median

$6,006

90th Percentile

$16,231

Score Distribution

28 diamonds scored across 4 quality tiers

Excellent

1 (3.6%)

Very Good

5 (17.9%)

Good

2 (7.1%)

Average

20 (71.4%)

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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