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

As of October 2026, 3.00 to 4.99ct I I1 natural round diamonds typically cost £10,901 GBP to £49,272 GBP, with a median price of £26,784 GBP. There are currently 54 diamonds matching this specification available across retailers.

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

About 17% of these diamonds are available at multiple retailers, with an average price spread of 79%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct I I1 Natural Round

Quick answer

As of October 2026, there are 54 natural round diamonds with I colour and I1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £10,901 GBP to £49,272 GBP, with a median of £26,784 GBP. At least 26 retailers stock this exact specification, and 17% of the stones appear at more than one of them, with an average price spread of 79%. Half of all listings fall between £3,393 GBP and £7,549 GBP per carat. The same specification in lab grown form lists at a median of about £4,956 GBP per carat. Over the last 30 days the median price moved -3.2% and the number of listings moved +2.0%.

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. Round natural stones in the index: 2,248 USD per carat, +7.6% 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

£3,439 GBP

Highest Price

£62,195 GBP

Average Price

£27,826 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

17.4%

Price Spread

79.1%

30-Day Price Trend

-3.2%

30-Day Supply Change

+2.0%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$7,041/ct

10th Percentile

$2,938

Median

$7,041

90th Percentile

$12,530

Score Distribution

230 diamonds scored across 4 quality tiers

Excellent

15 (6.5%)

Very Good

35 (15.2%)

Good

19 (8.3%)

Average

161 (70.0%)

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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