How much does a 3.00 to 4.99ct F SI2 natural cushion diamond cost?

As of October 2026, 3.00 to 4.99ct F SI2 natural cushion diamonds typically cost £15,196 GBP to £47,964 GBP, with a median price of £25,461 GBP. There are currently 64 diamonds matching this specification available across retailers.

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

About 41% of these diamonds are available at multiple retailers, with an average price spread of 41%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct F SI2 Natural Cushion

Quick answer

As of October 2026, there are 64 natural cushion diamonds with F colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £15,196 GBP to £47,964 GBP, with a median of £25,461 GBP. At least 50 retailers stock this exact specification, and 41% of the stones appear at more than one of them, with an average price spread of 41%. Half of all listings fall between £6,204 GBP and £9,431 GBP per carat. The same specification in lab grown form lists at a median of about £263 GBP per carat. Over the last 30 days the median price moved -0.3% and the number of listings moved +15.5%.

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: October 2026

Available

Lowest Price

£11,553 GBP

Highest Price

£96,956 GBP

Average Price

£29,666 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

41.4%

Price Spread

40.5%

30-Day Price Trend

-0.3%

30-Day Supply Change

+15.5%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$10,675/ct

10th Percentile

$6,649

Median

$10,675

90th Percentile

$14,929

Score Distribution

114 diamonds scored across 4 quality tiers

Excellent

36 (31.6%)

Very Good

28 (24.6%)

Good

17 (14.9%)

Average

33 (28.9%)

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Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

F I1I1 inclusions are not visible without magnification

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Lab-Grown F SI2Same specifications, lab-grown origin

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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