How much does a 3.00 to 4.99ct L SI2 natural round diamond cost?

As of November 6, 2026, 3.00 to 4.99ct L SI2 natural round diamonds typically cost £8,276 GBP to £20,997 GBP, with a median price of £12,785 GBP. There are currently 226 diamonds matching this specification available across retailers.

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

About 65% of these diamonds are available at multiple retailers, with an average price spread of 40%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct L SI2 Natural Round

Quick answer

As of November 6, 2026, there are 226 natural round diamonds with L colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £8,276 GBP to £20,997 GBP, with a median of £12,785 GBP. Half of all listings fall between £3,172 GBP and £4,770 GBP per carat. The same specification in lab grown form lists at a median of about £3,146 GBP per carat. Over the last 30 days the median price moved -0.2% and the number of listings moved +9.5%.

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

Caratlytics Diamond Price Index, October 2026: natural diamonds at 2,202 USD per carat and lab-grown at 462 USD per carat, a natural to lab ratio of 4.8 to 1. Round natural stones in the index: 2,124 USD per carat, -6.9% month on month. See the full index release

Figures come from current listings across more than 125 retailers. The index is a monthly release.

Last updated: November 6, 2026

Available

226

Lowest Price

£3,837 GBP

Highest Price

£34,942 GBP

Average Price

£13,786 GBP

Market Intelligence

Cross Retailer %

65.5%

Price Spread

40.1%

30-Day Price Trend

-0.2%

30-Day Supply Change

+9.5%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$5,359/ct

10th Percentile

$3,590

Median

$5,359

90th Percentile

$7,532

Score Distribution

226 diamonds scored across 4 quality tiers

Excellent

45 (19.9%)

Very Good

86 (38.1%)

Good

66 (29.2%)

Average

29 (12.8%)

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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